Why is the menu jumping in the mobile version?

Question

css

Good day. There is a problem - the site https://magicsteel.ru/ , on the mobile version, when you open the menu and scroll down, the menu "jumps", which causes certain inconveniences. The only thing I have seen so far is that the styles of the menu change when you scroll down to "nav-contaiter-fixed", but I did not find anything that would interfere with the normal operation of this menu :(

Answer 1

Actually, because of the addition fixedof on nav-containerwhen scrolling, it jumps. Here https://magicsteel.ru/catalog/view/theme/Electrify... cascade sets the height of the menu from the classfixed