My dishwasher runs and drains fine. But later (hours later), there will be standing water in it. Sometimes a little, sometimes a lot, enough to flow out onto the floor. I noticed we don't have a high loop in our line. But I feel like lacking the high loop would cause water backup immediately. Not hours later. Am I wrong in this assumption? Could my issue of the washer slowly filling up with dirty water be caused by not having this high loop?