Hi,
Regarding the resolution - on that dock you will get max 1080p over the 2x HDMI outputs. The DisplayPort output will get you 4K.
Regarding the issue. At a first glance that looks like a hardware issue.
If you swap out the dock > monitor video cables for others are you able to reproduce this?
Also if you lower the resoluton (to sub 1920x1090 on the monitors) do you still see this?
Regards,
James
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