Why is the site not scrolling to the end on mobile devices?

Question

css

Good afternoon.
I did an adaptive layout and faced the fact that on mobile devices the site does not scroll to the end, tell me, what could be the problem? Gif
site itself with a demonstration

Answer 1

Well, the site is good, but it's only you, I'm fine

Answer 2

It can be seen that the problem is only in mobile browsers, that is, a regular browser with a small width does not reproduce the problem. You can also see that the place to which the page scrolls depends on the width of the screen.
Pages in mobile and narrow desktop browser look the same.
Judging by how the page is twitching, setTimeout/setInterval/onscroll is working, which returns scrollTop.
There is a lot of code, it is difficult to debug it online.
You need to turn off functions like scroll() little by little and watch the result.
Or try rewriting the mobile browser detection functions so that all browsers are considered desktop.