You're welcome to 'clean up' that file.
Users can chose if they want to upload an avatar or create on from images they uploaded into an album.
So in my case the avatar manager tells me
QuoteYou can chose from 130 pictures!
little bit below it shows me these 130 pics with the header:
QuoteManage your avatar: Select an avatar from your already uploaded images
You'll have to check the checkbox behind that image, scroll down and click 'set as avatar'
OR
if you want to use an avatar not already uploaded, there's an upload box