The problem is solved, thanks for the attempt to help me.
The issue was that I didn’t use the standard Navigation preset and made my custom own one.
But I didn’t know how to put it in a dropdown for the adapted versions, therefore I added the standard Nav too, because it transforms automatically. But after adding that standard nav this issue with the navigation appeared.
I realized it because tried to delete it, and everything started to work well again.
I don’t how it influenced, but it did.
Now I’ll try to transform my own custom nav for adaptive versions.