One drawer drains into the other and vice versa

Question

When I run one of the two drawers - it doesn't matter which one - as the one drawer is draining, it will sometimes fill up the other drawer with the water from the drawer that is running. My husband and I took the drain lines off and ran a test, when the water hits the airgap, the machine doesn't seem to have enough pressure to push the water to the drain pipe so the first place it goes is to the opposite drain line and back into the other draw.