I did search but couldnt find a entry for this. I have several disks showing bonus disks entries where I dont have bonus disks. I used to be able remove them from personal Information tab. Now all I see is the Add disk button (which is a great feature BTW)

Sometimes DVDs are re-released without the bonus disc.

What you need to do is go into edit profile. Then go to the Discs tab... and there you can delete the bonus disc.