Same here. This has started 48 hours ago and seems to get worse by the day. All my plugins and wordpress are updated to the latest version.
Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for the delay and for any inconvenience this issue may have caused you.
Assuming you are using the latest version of all the plugins and the themes (please update if not yet), this seems like a cache issue. Could you try using a different browser (Chrome preferred) and try a hard refresh to clear the cache JS and CSS file with the page in question opened?
Windows: Ctrl + F5
Mac/Apple: Apple + R or command + R
Linux: F5
Hope that helps. Thank you and looking forward to your update.