Hello. Such a problem. There are two pages of the site: I did the 1st, my colleague the second. All common styles I wrote. As a result, on my page, when the screen is narrowed, the text in the headers incorrectly scales and increases, and everything on the page is fine. At the same time, he did not add anything and just added his selectors to my styles. I watched the code in the web inspector - everything is written the same.
For clarity:
imgur.com/a/v3QfA - my page,
imgur.com/a/3deTH - his