Users have login problems

Some users (rarely) complain of a login problem since Cloudflare is active on our domain, when they enter their credentials and click on “login” they are brought back to the login page, as if there were caches that give problems.
I have entered the rules to disable caches, but it seems they have not been disabled. I attach screen.

Schermata 2021-10-13 alle 10.23.42

The status header clearly shows that nothing was cached and the memory cache mentioned refers to your browser. Cloudflare does not cache anything here.

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