T W on the BB with Chuck and Gator: Hellbender/Pagebender Hybrid

It's not supposed to to that. Dialing down the mids cuts only the mids around 650Hz. Max cut is 12dB. Something is definitely wrong with board.
Maybe you can get a 2nd set of eyes to check your schematic & board routing. Also visually check the soldering for shorts.
 
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