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Thank you, and also @miro_o for your feedback!
There has been a bit of misunderstanding though -
that Frontier software apparently gives two options for high quality scans: 1) tiff 16 base, and 2) lossless.
The files they gave me were created using the tiff 16 base option - giving me the 16.9 MB, 2433 x 2433 px .TIF files (from 6x6 negative).The "weird" image I included in the earlier post with the black bar at the bottom (a 55.9 MB .RAW file originally) was given to me just to see if I could somehow open / convert it - which is, according to that guy in the lab, only possible with special software from Fuji Japan - which is why they don't hand out these .RARs to customers, but tiffs (or jpegs) instead.
salad
Going off what @miro_o is saying, it looks as if the image dimensions are incorrect. I did a uni project last year where I was researching tiff formats. From what I understood, pixel data in digital files are saved in a string of data, so when the computer draws it out, it does it row by row according to the dimension of the image. If the dimension data is changed compared to the pixel data, all the pixels end up skewed. From the looks of your image, the width of the dimensions have been increased and so there are more pixels per row then there should be. Which is why there is the black bar at the bottom where there is no pixel data at all.
When you open the raw files in photoshop, does it ask you to specify dimensions?