Odd Movie Issue

I hope this makes sense. I have all 4 of the Hunger Games movies, but there is an issue with the last two.

The Hunger Games Mockingjay Part 1
The Hunger Games Mockingjay Part 2

When just Part 1 is in the library, no issues. When I add Part 2, Part 1 renames itself to Part 2, but Part 2 actually never appears in the library.

If I reverse this and start with Part 2 only in the library, then add Part 1, the same thing happens; Part 1 doesn't show up but Part 2 renames itself.

Any ideas?