I found the problem (thanks for sharing the file). Most camera images have two EXIF date fields: the “original” and the “digitized”. They are usually the same, and the app doesn’t want to show two of the same thing, so it picks one. It picked Digitized. However, the FFF files only have Original and the app did not have code to fall back to that one when digitized was missing. I have made the change, so in the next update the dates will be correct for your files.