Ive not ever seen this before, but after aligning the photos in our project Im getting a mismatch in tie points. One area of tie points are raised above the adjacent points. The area is fairly homogenous and I am certain this has something to do with it. Even still, how do we remedy this? It looks like a perfect seem right down the middle of the tie points. I will caveat and say that we did not fly this ourselves but are processing for another outfit. So I do not know what parameters they flew the area with. We have tried re-running the images a couple of times and are getting the same results.