No WAF rule, but a page is blocked

The page itself work fine, it’s the /wp-admin/admin-ajax.php that is blockd and get an 403 error and do not display the javascript photo gallery.

In the Cloudflare firewall logs I have this even as a Block with a “custom rule” but I have no custom rule. I think that is some rule that I did in the past that is not visible but active in some area of the Cloudflare system.

Thanks