Part score problems

I was working on a large jazz score and I opened all of the default part scores. They looked fine. Then I added a bunch of repeats to summerize the score a little and then I find out that the horn scores are decorrelated from the main score: I select a measure with silence and I see notes on the part score, like it had missed a couple bars.

Fortunately I can work arround this problem by creating a new part score with the problematic instrument, but it clearly should be fixed.

This is what it shold be:

This is the default part score (note that the E1 and F2 sections are missing):