Hello Giovanni,
I am sorry about the issue you are experiencing and I am happy to assist you with the W3 Total Cache configuration.
Can you please check if the Page Caching is disabled for logged-in users in Performance>Page Cache, and also Check if Minify is disabled for logged-in users in Performance>Minify.
If not, please enable those two options, save all settings and purge the cache and see if the problem persists.
Thanks!