Those things make noise and problems i use to use one that i would suspect is the problem ..As you see it needs usb power and that is a problem makes noise lines in the picture..
It will be the problem almost 100% cable is dead simple there all the same try connecting direct vga with the cable to some other tv or monitor..
I had to upgrade to fix that problem to this https://www.ebay.com/itm/203502447153 i get no problems using this cheap ass one.. Also cheap but fixed all problems .. Course it prolly matter what usb power you use some are just crap and add noise and lines

Connect the dc direct with the cable to the pc monitor i can bet it be clean