......or take a long straight fairly narrow rod or bar, if you have something like that, and run it straight through the two holes on both FEL arms where the pins would go.....long enough to rest simultaneously through both holes....and see if the holes line up without any twist off-line, or if one of the arms is torqued and not completely squared up......i.e., the rod should be completely parallel to the bucket left-right itself if you get both arms lined up equally, and centered in the holes on both sides, and the holes should look aligned with the rod.
Or, forget the rod and just line up the two arms and sight down thru one hole in one arm across to the other hole in the other arm......go on both sides, and see if you can notice a twist in one or the other arms. Since the ends of the arms are the furthest points on the FEL from the bucket, any twist would be noticed most easily at the ends of the arms, and unfortunately that's where your arms rest on the tractor and where the pins insert.......which would correspond to the misalignment that you show in your picture. It would be like a long telescope where both ends aren't square to each other, but instead a degree or two misaligned.
Something's bent somewhere. Question is where, and how bad, and how much of a headache to fix. Guys with more machining experience than me can tell you.....or ask your dealer's mechanic if he sees this kind of thing.