Cam Link Pro Issue. 4k only on HDM1

Hello,
I am using OBS and the Cam Link Pro card to record a 4k image from 3 cameras in 3 different scenes.

My problem is that I only get a true 4k image on HDMI 1. On HDMI 2/3/4 OBS only shows me a FullHD source.

This seems to be only a problem in OBS, because in the Elgato 4k Capture Utility Tools I get 4k correctly displayed on all HDMI inputs.
For testing purposes I installed vMix, there it shows me a 4k picture on all HDMI ports.

Does anyone have the same problem?


My OBS Log:
 
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