Yes, as ED says, marker actions are not 100% exact, that's just how it is.
Maybe alternative (to get exactly trimmed recordings):
Recording mode: "time selection auto punch"
edit:
To answer your question, they are queried (meaning checked if playhead is on / past action marker already) in a relatively low frequency to avoid high CPU cost, so small overshoots as in your case can happen.
Last edited by nofish; 02-10-2018 at 05:23 PM.
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