Question / Help Cant Alter Video Proc Amp Settings

Im using my Magewell Pro Capture HDMI card with OBS and am trying to get the brightness, contrast and saturation right. But for some reason when i go into the property settings for my capture card in OBS and click the 'Video Proc Amp' tab and try and alter brightness, contrast or saturation values nothing changes in the preview window and once i exit the 'Video Proc Amp' tab and go back none of the settings have been saved.

How do i go about getting these settings to work?
 
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