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New Form3 makes thump sound when platform rises during printer

Hi! I just got two new Form3 printers a few months ago. One makes a thump sound when the platform rises, the other one doesn’t. Does anyone know if this abnormal and what the cause may be?

Here are the videos attached

I get the thump sometimes. It’s just the last printed layer sticking to the resin tray. It all depends how much area was printed and where it was printed in the tray location on the last layer.