Door gap closing.

[PbFut]

Looking for ideas. First, with all the work done on this truck, I purposely avoided door removal. Yesterday I noticed the lower front gap on right side front of door has disappeared. Further quick inspection shows alignment of front part of fender has dropped. I have to concluded I failed to tighten sufficiently when installing fender. I did have the inner fender off and on while swapping headers recently. Radiator support bushings are 1 year old. I think it's just my fault with fender install about 6 months ago. Any other thoughts I may have overlooked?