So I installed a disposal unit, where there wasn't one previously. and
when the sink fills up with a little bit of water (from items being
placed in the unit) and i turn it on, some of the waste gets pushed up
and out the opposite sink drain hole... covering the newly washed and
drying dishes. I can prevent this from happening by putting the plug
in the other side... is this common though? is my plumbing wrong? it
looks like this (it's a double sink, obviously)

the rest of the waste goes down normally, it just is looking for the
easiest way out...I hope my lay out looks correct.


Wash sink Dry sink
_____________|_______________
GD ||
|| ||
======T=======
||
||
Wste===== ||
|| ||
= PTRAP