Bottom drawer drains into top drawer

Question

I love my fisher paykel double dish drawer, but I have had a lot of problems with it. For the many times it has had to be repaired I could have bought a new one. This is my second set. Anyway my latest problem is the bottom drawer empties into the top. The way I solve this is to run the bottom about a minute before the top so when finished they are both dry. If I run the bottom first and the top is already finished Then I run the top on rinse to empty the water out. Any ideas on fixing this myself, I'm going broke paying repair people