The site cookeryschool.com.ua (site on WordPress) has a slider with courses (made using bx-slider), on different width screens the slider is displayed differently (4 in a row, 3 in a row, 2 in a row and on smartphones 1 in a row). As soon as you enter the site from any iPhone and scroll down to this slider, the slider is displayed like this:
But if you click on the arrow to the right or left, then everything falls into place:
That is how it should be:
This problem is observed only on apple smartphones, on the androids of this bug is not detected, tell me how to solve?

