WTF is going on with this penalty

very dubious to award it but can just about accept it diverted off his hand.

Then it was saved with Ayew's soft spot kick but VAR then said De Gea was about 1cm off his line and ordered a retake.

So then they change the taker to Zaha who scores.

To award it in the fist place was harsh, to make them retake it was ridiculous and then to allow them to change the taker was a farce.