The film is light struck. The cyan/green coloration is because the yellow-forming and cyan-forming layers of the film are the first two at the surface, while the (Fuji only) green-forming and red-forming are below them, so a faint light falling on the surface of the film will preferentially expose those layers (also, the cyan dye is much stronger, visually, than yellow, so it'll show more).

The image areas in the portion of the roll that's affected likely also have a cast that will scan or print as yellow/orange. If the unaffected frames are at the end of the roll, there may have been an accident with the back of the camera that exposed only the film that was already out of the cassette. Since this is happening with a majority of your films, you might also look for things like a wristwatch with a light that can come on automatically (in the changing bag), pulling your arms out of the bag sleeves while the film is open, or other sources of small amounts of light while you're loading the film into the processing tank.