Robert Earnshaw scored both goals. The first when the frontman was left free to convert from a cross. Jon Parkin then equalised as he too was left free in the box to finish.
Davies and Lonergan then decided to gift away any hope of a point as a mix up at the back allowed Earnshaw to sneak in and hit home the winner.
Preston now face a trip to Palace before they go back home to Deepdale next week. Many more away days like this will mean Preston will fall behind many of their rivals.