but why does it keep doing it?

What model are you talking about. If it is a dishdrawer, you first need to know which one is leaking. Dry the tray, run only top drawer for a day or two. If tray stays dry then run only bottom drawer. When you know which one is leaking, check lid seal. Check surface of tub where seal pulls down onto it should be clean & smooth. Check under drawer for any sign of leak. Once you locate the source of the leak then you can repair that part.

Lincoln Appliance NZ
November 2008