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This appears to be a matter of pressure and flow rate.
Can you upload a picture of the setup under the sink please?
There are a few options such as fitting a non return but thats not an ideal approach, by seeing the setup I may be able to give you a better solution.
Let me know how you get on, and if you have any further questions.
Hi Martin, I havent heard from you in a while so wanted to follow up to see how your have got on with the dishwasher drained problem?
Just to clarify you ended up changing the waste pipe layout, as I thought you mentioned you were happy with the waste pipe layout above and wanted an alternative solution?