What causes wheel gaps to be uneven?

[detroiter]

I was checking my wheel gaps today to see how things are since the lowering springs and shocks have been installed for a while now. It seems like two of the gaps were much shorter in distance as compared to the others being a bit bigger in gap size. I can't imagine any reason why it would be that way since they've had time to settle and the air pressure is even in all tires. I did hit a monster sized puthole the other day but as far as I can tell it didn't throw the alignment off at all so I have no idea what could be the reason it's uneven. My only guess is maybe just the pavement has to be completely smooth and flat to get an "even" look all the way around?