So some of the members on my forum pointed out that if people don't have avatars then when they post then it looks messy as you can see by the yellow arrow. Any idea on how to fix it? I'm using Mybb forum software.
I think Jason5 is right. I see the alt (text) attribute displayed instead of the default avatar. There's also some disparity between browsers i.e. Firefox displays just the alt attribute whereas Edge appears to append a graphic as per your screenshot.