[TulsaREIA]

I had the same problem and I added this CSS to my theme in the Custom CSS section, if you don’t have Custom CSS section, you can create a child theme. I don’t know if its buddypress or a plugin but some avatars in “activity” are set as “mini” making the 20×20 avatar. It may look good in replies but not in the situation you described. Here is the custom CSS I used to keep the mini avatar at 50×50 like the rest of my activity stream.

#buddypress .activity-list li.mini .activity-avatar img.avatar, #buddypress .activity-list li.mini .activity-avatar img.FB_profile_pic {
height: 50px;
margin-left: 0px;
width: 50px;
}