OK, not too many technical things get me scratching my head, but this puzzle is at the moment!!
I had a client on a recent workshop shooting 9 shot bracketed exposures with an X-T2 and 10-24 (tripod mounted), he believes that he had IS switched off.
On some of the image sequences, some of the images are at a different focal length - as reported by Lightroom - this stops them being merged by Lightroom. I have checked the images and they are indeed different, image edges move slightly, so I think the LR is reporting correctly. (He has sent me two sequences, on the first the first image is at 13.2mm and the rest at 12.6mm, on the second sequence all images are at 16.6mm and the 2nd/4th/6th images at 17.4mm). The average exposure duration was quite long - 14 seconds on first sequence and 3.5 seconds on second sequence)
I normally use primes (no-IS). Could IS being inadvertently on potentially cause this issue, or is there some other kind of equipment issue. If IS is not at fault, then I would suggest that the lens is sent to Fuji to be checked out.
Any ideas?