Mine was grounded to the rear chassis, as you can see in my picture, if Mystic bought from Doukmall-US on Ebay too. But yea, they don't QC their stuff, and I'm sure the MOSFETs they are using aren't checked for function before installation. They did say they were willing to refund some money if I went to a repair shop, but all the local ones are closed due to COVID. On Aliexpress they sent a new module over to some guy in Russia in the review section. I might have taken them up for that offer in a different time.