Hi @jgodsey, Welcome to Community!
That just looks to be your profile Icon - please see this similar thread:
So I believe the reason that your profile icons are different is that that cat icon was part of the previously available icons, but since this update https://github.com/brave/brave-browser/issues/6443 they have been changed to solid color icons. So since the cat icon is gone, Brave is just showing a yellow circle. If you change the icon to one of the solid colour icons the yellow circle should change to match.