I found late model Tigs have load sensitive motors. If there is resistance it will reopen about 10cm. 2017 Tiguan used to have pressure pads on the left and right side of the latch in case there was obstruction. My 2019 model doesnt have those.
so back to your question. If the hatch meets obstruction it will reverse closing and open a short distance after meeting resistance. You may also have an issue with the latch not closing hence the hatch reopens. You should hear the latch attempting to close. What happens if you gently help the hatch to close?
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