I found several topics asking about the same thing but got no solution.
In my case, wrong buttons are shown in the navbar while their visibility conditions are set correctly. If I delete the conditions and add them again, it works fine for some time but then it glitches again.
Webflow used to have some issues regarding User Accounts and login-state-condition-visibility within Components.
I’m not sure those issues have been 100% resolved. You might try using the visibility setting on elements that are outside of any Components and see if it works more consistently.
I found a topic about that and I did unlink it but unfortunately it was all the same, doesnt matter if it’s a component or not. Too bad it didn’t get fixed until now.