Question Weird horizontal lines showing whenever something dark is displayed on one of my screens

Oct 10, 2019
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I have 2 displays

to the left Iiyama 27" 1080p 60hz (HDMI)
to the right Iiyama 27" 1080p 144hz (DP)

(B2712HDS, GB2773HS)
GPU: GTX 770

I wonder why my right screen which has the same pixel density has these wierd horizontal lines showing whenever something dark is displayed, and why my screen to the left behaves differently. Because i have no idea and i am somewhat annoyed by the difference.

(enlarge picture to see it)
Picture:
View: https://imgur.com/a/KLuFvV4

Sometimes (2/10) when powering on pc i have to unplug an plug DP cable in because it doesn't detect the monitor

Any help is greatly appreciated.
 

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