When using OBS/Streamlabs OBS, why can I not record in 1920x1080 when input source is 2560x1440?

In OBS, choose Video Capture Device in Source section, and customize the resolution 1920x1080, instead of default value
 
 
In Streamlab OBS, choose Video Capture Device in Source section, and customize the resolution 1920x1080, instead of default value


By the way, you can record in 1920x1080 when input source is 2560x1440


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