All profile pages in our instance show posts with big avatars. Only in the public view, personal, local, and federated timelines look just fine. See for instance:
We have upgraded Mastodon recently, and maybe this is something related. However, since we don’t look our public pages often, there is a chance that this is an older problem.
Other than waiting for the next release to upgrade, I don’t know what I can do as an admin. Do you have any advice?