I dont know why but it seems that when you upload an avatar photo, that photo in added to the members photo album. If you want to stop that from happening, this is what you have to do.
You need to edit this file: /modules/boonex/avatar/templates/base/block_wide.html
Download that file and open it with your favorite html editor.
Look for the following line of code, it should be right around line 22:
<span><input type=”checkbox” name=”copy_to_profile_photos” id=”copy_to_profile_photos” checked=”checked” /><label for=”copy_to_profile_photos”><bx_text:_bx_ava_copy_to_profile_photos /></label></span>
Just remove that entire piece of code. Save and upload the file. That’s It!