No idea, how your model is working, but the reason could be blocking times:
in the setting after process ends, the recovery time starts already, if the part is still on the machine; in this cases blocking time and recovery time are overlapping (check the statistics of the machines).
After the part exit - enter; here is the recoverytime on top (here the waiting time portions should be greater).
If you guess, that the calculation is wrong, then send your model to GTAC.
freelance simulation specialist