Few guesses:
1. It starts of drifting heavily in both directions before the corrections start. How accurate was the polar alignment?
2. Small corrections had massive effect resulting in overshooting. PHD2 did the opposite small corrections resulting in massive opposite overshooting etc.
Did you setup the mount parameters correctly? Can't remember the name... "calibration step size" maybe? If that is too large, it could cause a similar effect.
Did you do the polar alignment first? How did that go?
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