This is a bug that has existed since at least version 2010. At times, the wrong image is linked to a citation. If I edit say, an 1880 Census record/citation, then download another census or other record, the image for that record may be linked to the previous record. The image is correct for the file as you note, but linked to the wrong citation. Unfortunately, the action of the image merge is not consistent.
Regards,
Regards,