Bug when scrolling the page in safari on Iphone?

Question

css

Gentlemen, I ran into the following problem.
There is a template html site on bootstrap. It is located at test1.artsnntest.ru .
The situation is as follows, when scrolling a page in safari on my iphone se (there is no other way to check), the displayed page behaves inappropriately (as in the video). And if you make a quick touch-scroll (swipe your finger without holding it) it works even more or less, and if you touch-scroll (hold your finger and scroll), but some crap starts.
-When scrolling in chrome with a choice of devices, this problem is not observed.
-When using the https://www.browserstack.com service, this problem is also not observed.
But on the physical device is. What can be wrong? Tell me where to dig and what to look for?
Video from the phone: Yandex disk Tyk
Video in the form of a gif: Tyk

Answer 1

var isMobile = /iPhone|iPad|iPod|Android/i.test(navigator.userAgent);

if (!isMobile) {
    $("body, textarea").niceScroll({
        cursorcolor: "#151515",
        cursorwidth: "6px",
        background: "#f0f0f0"
    });
}