Mono not Stereo

Running 2.3 on hp laptop. Recording stereo tracks from a 1\4 inch reel-to reel via behringer board which has an output to usb which I run to laptop.

Toolbar is: MME, codec-usb,2(stereo recording), Speakers …

When I have the left channel on board muted, audacity is not seeing the right channel, tho I’m seeing the right channel at the board.

The board’s main plays back stereo when I have both board sliders up, but I only getting mono at pc when both sliders up.

I have the Preferences set to stereo.

???

Look in the Windows Sound Settings and ensure that the Behringer USB recording device is set to “2 channels (stereo)”.
Windows will frequently set USB devices to mono by default.