The DVDs part of the boxset, are not listed under the boxset, but listed anywhere based on the order you selected (or some other strange reason as shown with Desparado)

For example the following boxsets are wrong: Desperado/El Mariachi, Jurassic Park, Romancing the stone/Jewel of the nile, etc...

I cannot find how to make them stick together.

It was/is working fine in 2.5