roles are changing from FCPX to X2pro

I've to send an AAF to Pyramix from FCPX, and i've a problem with one role which is divided in 3 subrole : HF1 / HF2 / ST MS. When i open the index i effectively see only those 3 subroles but when i open the fcpxml in X2Pro i see 5 roles HF1 is ok HF 2 don't exist but i have a Dialogue HF2 without with only part of the clips ST MS exist but also a Cam 1 Return with some clips of HF2 and Cam 2 Return with some clips of ST MS ...
I don't understand what happen.

Any idea ?