Lana, a lot of dishwashers leave water in the bottom. One thing you can do, close the door and start the machine, the first thing the machine does is empty any water before starting the cycles. So turn it on, let it run for maybe a minute, you should be able to hear when it has sucked out all the water it left behind, then just turn it off.

It is a PITA but it does work. I have to do this maybe every 10th time I use my machine.