I think on the top 3 you've straightened them (either in camera or in PP) using the outter edges of the frame as a guide, as #1 is straight by the to let sign, and #2-3 are straight by the building on the left, but the building in the middle isn't, probably because you've straightened by something which would be distorted as it's at the edge of the frame.
There's probably a more technical way of explaining that, hopefully you get what I mean.