Hello Evgenii! Sorry for the issue with here with the tooltips. I see what you mean and can help you troubleshoot it.
I’ve seen the same thing happen a couple of other times (such as this thread) and both times it was related to a conflict with a caching plugin being used on the site.
Are you using a caching plugin on your site? If so, please try disabling the minification feature as suggested in the thread mentioned above to see if that help resolve the issue and let me know what you find.
Cheers!
Geoff