Reply to Technic 1200 RCA Problem

I have a pair of technic 1200 Mk2's with a stanton m203 mixer that works but there is one problem when i try to plug both of the rca cables of both turntables into the mixer the sound comes out fuzzy/distorted/just weird. But when i plug the rca either the white or red of both tables they work, but i'm assuming its only playing L and R respectively to the rca cable plugged in. Any idea why this problem is happening I'm pretty sure they are both grounded to my mixer fine. Thanks!!