Your words are valid for paid plugins, not free.
And I can’t fix the plugin as it works, so far as I can see. The problems is somewhere with other plugins’ compatibility, and you should understand that it’s impossible to test against 30000+ plugins in the repo and from other sites.
Disable all plugins, except BuddyPress and mine, and check the plugin against your theme. If it works – start enabling plugins one by one, checking on each step how Avatar Bubble behaves on front-end. If it doesn’t work with your theme – most likely that’s the theme issue, but more details needed anyway.