Update : the problem were the faulty mobile tensioners bought from eBay. In the pictures, left side is the new tensioner, right side the old OEM tensioner. Notice the distance between the roller bearing and the metal part. Do you think im entitled to get refound for these tensioners? They were of course mounted on the bike. Thanks for helping me guys.
https://ibb.co/zGRR60Q
https://ibb.co/Vq4w7wr
https://ibb.co/H431Bfc