washer dryer cold water inlet hose leaking into drum during dry cycle?

we have problems with the cold water inlet hose leading to our washer dryer, it seems to let water back into the drum during the dry cycle, causing the should be dry washing to be soaking wet and sometimes swimming with water. we tried a brand new washer dryer on our connection and although there wasn't a mass of water, the longer we dried the washing for the wetter it got! any suggestions?
blue cold water hose with water off, comparing the amount of water released through outlet (into a bucket!) with water turned on and off, a considerable difference was noted.