Problem with mobile menu

Hello,
I try to implement the mobile menu, and i got some problems.
Sometimes it works, but for no reasons, in 5-12 hrs i get the same result (it changes back).
Link 1 – where you can see the actual problem, i do no want that red thing to appear:
https://pasteboard.co/JgQiMYB.png

Link 2 – how it works, when it does (only for a few hrs then it returns back to the red thing as shown in link 1):
https://pasteboard.co/JgQj1Sz.jpg

Link 3 – another view on the menu (as it is bugged, i got same problem as in mobile view or when i minimize the window as shown):
https://pasteboard.co/JgQkCYo.jpg

The page I need help with: [log in to see the link]