Pickup machine not in sync

Hey there,

i have the following problem:
i’ve set up a pickup machine on track 7 to loop stems that are running on track 1-4. The first time everything works fine. I set the recording setup, so that the pickup machine starts recording after the pattern and play back after the pattern. I set up the recording length to 64.
After recording the first loop i change the pattern where i play back the recording buffer 7 with a flex machine. After changing to the next bank that includes my next track track i want to repeat the whole thing with a pickup machine, but now it seems like the pickup machine stops recording slighty too early and now the loop isnt in sync anymore, although in the recording setup everything is quantized. After stopping the playback everything works fine again in the same pattern. So it happens only when using the pickup machine a second time while running the sequencer. Any ideas what i can do?
I already checked the ram size of the record buffers…