make sure you click on the little circle thing in the top left of this image

if that's not the problem, idk what to tell you :v
when you change it click f5.
it would be ctrl+F5 or shift+F5, depending on the browser, but just regular old F5 wouldn't work
that's obviously not the problem anyway, though. that issue only affects the person trying to upload the avatar. we'd still be able to see it