I won't be able to help but those who can will definitely need more information like on which device and which browser for starters.
Perhaps you can send a pm to Amin Sabet or Richard (Growltiger) to make them aware of your issue?
For the record, I haven no issues with this either.
Running macOS Big Sur but haven't updated to 11.3.1. Going to do that tomorrow. However both Safari and Firefox do not give me the options for making text bold, changing colors or fonts, etc. Chrome works exactly as it should, but is not my preferred browser.