Strange bugs with Backend

I just uploaded my local development site to the server and registered the license.
Version 3.1.1
Sometimes the version is shown in settings, sometimes blank.
Sometimes it says my license is not registered and sometimes it is.
Sometimes I can’t upload content, sometime I can.
Sometimes multilanguage is working in backend, sometimes not.
Sometimes in backend I can’t access pages. It says unauthorized.
Is it possible that there is a problem with my .htaccess?
Or do i have to delete sessions in site/sessions?
I have no ideas.

Could you also please check if there are any errors in your browser console or in the server error logs. Also, try disabling caching in your browser. It’s probably also worthwhile to test with different browsers.

Thank you, seems to work now.

Thanks for your feedback, let us know if you run into this again.