Cached pages in WordPress

Hi,

I am having big problems with my WordPress Admin panel in Chrome browser, whereas WordPress Admin panel in Internet Explorer works perfectly! WP version is the latest 5.5.

I have problems with plugins like Hummmingbird, W3 Total Cache and Updraftplus, at least. For example, I can not deactivate a plugin in Chrome. Or if I delete a plugin, and browse around in WP admin, and later come back to Plugins then the plugin is still “Active”.

Updraftplus is not responding when I click “Backup” (in Chrome).

So this is strange beacuse it works in Internet Explorer but not in Chrome. I tried to delete Browsing history, purging cache with Hummingbird, W3 Total Cache, Cloudflare (unabled on site right now).

Any ideas?