When you close all the modal windows on the site, they again open themselves. Closing takes place either through the close button with data-dismiss = "modal" or by clicking on the overlay. Moreover, after the window opens after closing, the overlay is not displayed, the modal-open class is not added to body and the window is no longer closed by the close button.
What is the reason and where to dig? There are no errors in the console. Glitch has appeared recently, nothing new has been added.
PS modal.js v3.2.0
UPD:
/* Bootstrap: transition.js v3.1.1 */ +function(n){"use strict";function t(){var n=document.createElement("bootstrap"),t={WebkitTransition:"webkitTransitionEnd",MozTransition:"transitionend",OTransition:"oTransitionEnd otransitionend",transition:"transitionend"};for(var i in t)if(void 0!==n.style[i])return{end:t[i]};return!1}n.fn.emulateTransitionEnd=function(t){var i=!1,r=this;n(this).one("bsTransitionEnd",function(){i=!0});var e=function(){i||n(r).trigger(n.support.transition.end)};return setTimeout(e,t),this},n(function(){n.support.transition=t(),n.support.transition&&(n.event.special.bsTransitionEnd={bindType:n.support.transition.end,delegateType:n.support.transition.end,handle:function(t){return n(t.target).is(this)?t.handleObj.handler.apply(this,arguments):void 0}})})}(jQuery); /* Bootstrap modal */ +function(t){"use strict";function e(e,s){return this.each(function(){var i=t(this),n=i.data("bs.modal"),a=t.extend({},o.DEFAULTS,i.data(),"object"==typeof e&&e);n||i.data("bs.modal",n=new o(this,a)),"string"==typeof e?n[e](s):a.show&&n.show(s)})}var o=function(e,o){this.options=o,this.$body=t(document.body),this.$element=t(e),this.$backdrop=this.isShown=null,this.scrollbarWidth=0,this.options.remote&&this.$element.find(".modal-content").load(this.options.remote,t.proxy(function(){this.$element.trigger("loaded.bs.modal")},this))};o.VERSION="3.2.0",o.DEFAULTS={backdrop:!0,keyboard:!0,show:!0},o.prototype.toggle=function(t){return this.isShown?this.hide():this.show(t)},o.prototype.show=function(e){var o=this,s=t.Event("show.bs.modal",{relatedTarget:e});this.$element.trigger(s),this.isShown||s.isDefaultPrevented()||(this.isShown=!0,this.checkScrollbar(),this.$body.addClass("modal-open"),this.setScrollbar(),this.escape(),this.$element.on("click.dismiss.bs.modal",'[data-dismiss="modal"]',t.proxy(this.hide,this)),this.backdrop(function(){var s=t.support.transition&&o.$element.hasClass("fade");o.$element.parent().length||o.$element.appendTo(o.$body),o.$element.show().scrollTop(0),s&&o.$element[0].offsetWidth,o.$element.addClass("in").attr("aria-hidden",!1),o.enforceFocus();var i=t.Event("shown.bs.modal",{relatedTarget:e});s?o.$element.find(".modal-dialog").one("bsTransitionEnd",function(){o.$element.trigger("focus").trigger(i)}).emulateTransitionEnd(300):o.$element.trigger("focus").trigger(i)}))},o.prototype.hide=function(e){e&&e.preventDefault(),e=t.Event("hide.bs.modal"),this.$element.trigger(e),this.isShown&&!e.isDefaultPrevented()&&(this.isShown=!1,this.$body.removeClass("modal-open"),this.resetScrollbar(),this.escape(),t(document).off("focusin.bs.modal"),this.$element.removeClass("in").attr("aria-hidden",!0).off("click.dismiss.bs.modal"),t.support.transition&&this.$element.hasClass("fade")?this.$element.one("bsTransitionEnd",t.proxy(this.hideModal,this)).emulateTransitionEnd(300):this.hideModal())},o.prototype.enforceFocus=function(){t(document).off("focusin.bs.modal").on("focusin.bs.modal",t.proxy(function(t){this.$element[0]===t.target||this.$element.has(t.target).length||this.$element.trigger("focus")},this))},o.prototype.escape=function(){this.isShown&&this.options.keyboard?this.$element.on("keyup.dismiss.bs.modal",t.proxy(function(t){27==t.which&&this.hide()},this)):this.isShown||this.$element.off("keyup.dismiss.bs.modal")},o.prototype.hideModal=function(){var t=this;this.$element.hide(),this.backdrop(function(){t.$element.trigger("hidden.bs.modal")})},o.prototype.removeBackdrop=function(){this.$backdrop&&this.$backdrop.remove(),this.$backdrop=null},o.prototype.backdrop=function(e){var o=this,s=this.$element.hasClass("fade")?"fade":"";if(this.isShown&&this.options.backdrop){var i=t.support.transition&&s;if(this.$backdrop=t('<div class="modal-backdrop '+s+'" />').appendTo(this.$body),this.$element.on("click.dismiss.bs.modal",t.proxy(function(t){t.target===t.currentTarget&&("static"==this.options.backdrop?this.$element[0].focus.call(this.$element[0]):this.hide.call(this))},this)),i&&this.$backdrop[0].offsetWidth,this.$backdrop.addClass("in"),!e)return;i?this.$backdrop.one("bsTransitionEnd",e).emulateTransitionEnd(150):e()}else if(!this.isShown&&this.$backdrop){this.$backdrop.removeClass("in");var n=function(){o.removeBackdrop(),e&&e()};t.support.transition&&this.$element.hasClass("fade")?this.$backdrop.one("bsTransitionEnd",n).emulateTransitionEnd(150):n()}else e&&e()},o.prototype.checkScrollbar=function(){document.body.clientWidth>=window.innerWidth||(this.scrollbarWidth=this.scrollbarWidth||this.measureScrollbar())},o.prototype.setScrollbar=function(){var t=parseInt(this.$body.css("padding-right")||0,10);this.scrollbarWidth&&this.$body.css("padding-right",t+this.scrollbarWidth)},o.prototype.resetScrollbar=function(){this.$body.css("padding-right","")},o.prototype.measureScrollbar=function(){var t=document.createElement("div");t.className="modal-scrollbar-measure",this.$body.append(t);var e=t.offsetWidth-t.clientWidth;return this.$body[0].removeChild(t),e};var s=t.fn.modal;t.fn.modal=e,t.fn.modal.Constructor=o,t.fn.modal.noConflict=function(){return t.fn.modal=s,this},t(document).on("click.bs.modal.data-api",'[data-toggle="modal"]',function(o){var s=t(this),i=s.attr("href"),n=t(s.attr("data-target")||i&&i.replace(/.*(?=#[^\s]+$)/,"")),a=n.data("bs.modal")?"toggle":t.extend({remote:!/#/.test(i)&&i},n.data(),s.data());s.is("a")&&o.preventDefault(),n.one("show.bs.modal",function(t){t.isDefaultPrevented()||n.one("hidden.bs.modal",function(){s.is(":visible")&&s.trigger("focus")})}),e.call(n,a,this)})}(jQuery); $(document).ready(function(){ $('.open-callback').click(function(e) { e.preventDefault(); var $modal = $('#modal-callback'); $modal.modal('show'); }); }); .modal-open { overflow: hidden; } .modal { position: fixed; top: 0; right: 0; bottom: 0; left: 0; z-index: 1050; display: none; overflow: hidden; -webkit-overflow-scrolling: touch; outline:0; } .modal.fade .modal-dialog { -webkit-transition: -webkit-transform .3s ease-out; -o-transition: -o-transform .3s ease-out; transition: transform .3s ease-out; -webkit-transform: translate3d(0,-25%,0); -o-transform: translate3d(0,-25%,0); transform: translate3d(0,-25%,0); } .modal.in .modal-dialog { -webkit-transform: translate3d(0,0,0); -o-transform: translate3d(0,0,0); transform:translate3d(0,0,0); } .modal-open .modal { overflow-x: hidden; overflow-y: scroll; } .modal-dialog { position: relative; } .modal-content { position: relative; } .modal-backdrop { position: fixed; top: 0; right: 0; bottom: 0; left: 0; z-index: 1040; background-color: #000; } .modal-backdrop.fade { filter: alpha(opacity=0); opacity:0; } .modal-backdrop.in { filter: alpha(opacity=90); opacity: .9; } .modal-content .close { margin-top: -2px; padding: 0; } .modal-scrollbar-measure { position: absolute; top: -9999px; width: 50px; height: 50px; overflow: scroll; } #modal-callback .modal-dialog, #modal-result .modal-dialog { border: 5px solid #9a4f43; background-color: #ffffff; padding: 40px; text-align: center; width: 200px; margin: 20px auto; } .modal-content .close { position: absolute; right: 0; top: 0; color: #111; } <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script> <script src="http://cdn.jquerytools.org/1.2.7/full/jquery.tools.min.js"></script> <button class="open-callback">кнопка</button> <div class="modal fade" id="modal-callback" aria-hidden="true" style="display: none;"> <div class="modal-dialog"> <div class="modal-content"> <button type="button" class="close icon" data-dismiss="modal">X</button> <form>контент</form> </div> </div> </div> 
external resources? - Grundy