I never encountered this effect inside a loop. I guess the audio clips are setup once before playback starts.
It might be possible that it occurs in a loop, too, when I press play immediately after repositioning the playhead. Then it should happen in every loop pass. But I couldn't reproduce it so far.
There is another problem with loops: a small drift in time when loops are inside he bounds of an audio clip. Then – depending on the length, offset and whatever else – the audio file drifts after lots of loop passes, maybe during a rounding error. But this should be a completely different issue.
I never encountered this effect inside a loop. I guess the audio clips are setup once before playback starts.
It might be possible that it occurs in a loop, too, when I press play immediately after repositioning the playhead. Then it should happen in every loop pass. But I couldn't reproduce it so far.
There is another problem with loops: a small drift in time when loops are inside he bounds of an audio clip. Then – depending on the length, offset and whatever else – the audio file drifts after lots of loop passes, maybe during a rounding error. But this should be a completely different issue.