It sounds like you don't have an air gap installed. It's code most places and prevents back siphoning of the drainage into your dishwasher. Here's a couple of links that'll show you one and the details on installation, hope this helps.
Expert step-by-step instructions and helpful videos on how to replace or install a dishwasher, including electrical and plumbing hookups, installing the dishwasher in cabinets, attaching the dishwasher, how to handle the need for an air gap, and more.
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