Has anyone heard of this before? I can't find any info on the subject. Now that I'm hooking up triple monitors for sim racing I need to use more of the outputs on the back of my 2070. Problem is mine only has two DP, one HDMI, and one USB-C. HDMI is no good for high refresh rates, and it turns out this USB-C port can output like a DP port. Great. So I bought this adapter but I see subtle yet noticeable scrolling horizontal lines on whichever screen is using the USB-C port.

I'm thinking it's the adapter itself, but before I fork out $30 on a 6' USB-C to DP cable, are there any other ideas? Cable too close to something or other?