Some Sanyo camera's have (I assume) a software fault. For example the C4, J2 and J4 calculted the offset pointer for makernotes 12 to high
For example your picture sanyo-C4.jpg results in
sanyo-C4.html and should look like sanyo-C4.rmaker
p.e. Exif tool tag "MakerNotes_05 DigitalZoom" points to h'05cc and is located at h'05c0, see rmaker file "Makernote field-6".
Q1: should Exiftool handle software faults?
Q2: and rewriting the data should it repair, or make the same mistakes?