Hi
You have a configuration issue on your server: all 4SEO requests are redirected to the same URL. You can try it in your browser, for instance:
https://[redacted].com/administrator/?_wblapi=/forseo/v1/ping
When trying to load this page, your server redirects to the same URL, https://[redacted].com/administrator/?_wblapi=/forseo/v1/ping, again and again.
Note that this is not related to 4SEO, you can test the same thing with another URL:
https://[redacted].com/administrator/?something=1
You get the same behavior, there's a redirect to https://[redacted].com/administrator/?something=1 as well.
Most likely this is an incorrect instruction in your .htaccess, but it may also be something in your Cloudflare config as well (the redirect is extremly quick, I don't think it's done inside of Joomla).
Note that the problem can be in your main .htaccess file, but it can also be in another .htaccess, located in the /administrator directory.
Does that ring a bell? Do you use the standard Joomla .htaccess file or was there any change made? Do you have any rule in Cloudflare that would redirect pages
Side note: while looking through your plugin, I noticed you were using the "XT Perfect SEO pagination". You should disable it immediately, it implements incorrect pagination practice, Google recommends the opposite of what that plugin does. We can talk about that later if you want.
Best regards
Yannick Gaultier
weeblr.com / @weeblr