Hello my name is Rick, I will assist you today
It sounds like there is no high loop in your drain line from the dishwasher. If you think about it like a rollercoaster, straight out of the dishwasher, the drain needs to go to a high spot, above where it is hooked up to sink or garbage disposal and then routed to the drain site. This will make sure no maker how high you fill the sink that water can not travel backwards down the drain line
how dpo I correct this
I am assuming the drian line enters the cabinet, where the sink is, from there raise and secure it as high as possble. That will create a high loop and the unit will not backflow on you.
It has been a few days since I spoke with you and I just wanted to touch base and make sure your issue was taken care of