I’ve updated our hosted version of Discourse, this forum software, and reinstalled it the ‘proper’ way so future upgrades will be much easier.
However I’ve also managed to obliterate the locally-hosted avatars. I’m looking into it, but if might be faster if you re-upload your avatar if you’re able to. It has to be called a different name to the original file you used I believe, otherwise it doesn’t think it has to change anything.
Sorry for the hassle!