Bug in Ultimate Facebook - Facebook Comments section?

I'm using WordPress Multisite. In my network options for Ultimate Facebook, I have enabled "Preserve individual blog API settings".

When I setup the Ultimate Facebook settings in a subsite, it shows all the Facebook Page belong to the Facebook App of the main site in the "Skip importing comments for these accounts" under Facebook Comments section.

The main site and subsite are using 2 different Facebook App belong to different Facebook account.

Is this a bug? A subsite can view all the Facebook Page belonging to the main site?