PhaseToDisplacement command deleting data


I am applying gpt PhaseToDisplacement to an unwrapped sentinel 1 interferogram. The result of this is a bunch of strips of deleted data which exist in the unwrapped interferogram and I have no idea why it is doing this. The top image is the unwrapped interferogram in radians, then using the gpt PhaseToDisplacement results in a bunch of cut data as the bottom image.