What do you mean?
Viewing post in Heat Control - edging trainer comments
I mean:
- Go to e621.net
- Type "favoritedby:X" but replace X with your username on e621.
example: if I search for "favoritedby:mairo", I get the pictures that the user named "mairo" favorited on e6.
- Check if the results you get are indeed your favourite pictures.
If this instead shows regular posts, there has to be a problem with the username, maybe you changed it at some point and it still needs the old one, I don't know?