it's a sure bet you changed things just removing and reassembling - alignment of the front sheet metal requires a fair effort, not just bolting the right pieces in the right places, you'll find lots of threads here about the grief folks have had trying to get the front positioned well
it's very common to find
body shims on any old vehicle, required to get as close as possible to "right" - even changing the rotation of used rubber mounts can throw things out, an eighth inch tweak in one rad mount bolt can translate to a half inch extra gap at one back corner of the hood .... and maybe one bumper mount bolt was just loose enough that someone standing on the bumper shifted it a bit
Bill