I have a plan for the rounded avatars. I can change that to be circles or even a much more decreased rounded border.
The bigger issue is that the forum converts and enforces a square now of 90 x 90. This looks to be more baked into their code and not exposed at all anywhere.
Our previous forum software at this set to a standard that used more of a portrait dimensions that were 90 x 110. Most of us have our names or tops chopped, but also the large rounded border makes them look like circles so even more things are chopped.