It’s because we get the fan info with 2 different apps.
The profile ids are hashed with the apps ids so they get linked to the app that requested that particular fan (the new id is called app_scoped_id).
Sometimes we need to scan a page with 2 different apps resulting this.
For example one of the times is when 2 clients put the same page and it gets scanned twice.
We don’t have a fix yet - a simple fix is to uniq the fans list on the name - although it’s not perfect - we found a test case with an indian page with a lot of different people with the same name commenting on the same page.
When we improve the fans page we’ll fix this too. 2-3 weeks as i (always) say :))