Why is the menu not visible on the mobile version of the site (on iPhone)?

Question

iPhone

Good afternoon.
In the mobile version of the site, the menu items are not visible.
And it is not visible only on devices from Apple, on Android everything works fine.
On iPhone:

On Android:

I would be glad for any help, the site address is www.kuhnistrit.ru
Thank you!

Answer 1

https://www.mobila.name/post/528e709722cf2/ :)