Yes, as I said in my initial reply, check your tags.
It's quite clear from the screenshot that 1,3,4,5,6,8 are tagged differently in the Disc field than 2,7,9,10 are. The blank space is MB separating what it thinks are two different discs on the same album. It's doing this because you tagged them that way.
If you either add Disc 1 to the tracks that don't have a disc number or remove the disc number from the tracks that do have a disc number, it will display correctly. If you display the Disc-Track# field rather than Track#, you will see this in your listing.
As I said, MB is excellent at finding examples of your faulty tagging. That's part of what makes it a great library manager.