Server error in data/compare

If you install the wp debugging plugin, do you see any errors in the logs?

Please also check if you see errors in the browser console: right click, inspect, console.

Hi Rogier,

I see this errors in the browser console https://prnt.sc/6Qw0xWiDsyoq

P.S.: No errors in debug.log

I see some 503 errors in the log, it might be the server is rate limiting the api calls, your hosting company might be able to tell you that. What is your hosting company? Sometimes a hosting company has some documentation on what is causing a 503 in their specific configuration.