The 17th indicates that is heading off-map for the exit hex. The 'exit hex' seems to be Exmouth.
I suspect that the TF reached Exmouth on the run for the 17th, checked that it was at the exit hex, and reposition itself at the on-map entry point (just as if it arrived at the proper exit point for the CT entry hexes - shaded hex column near CT) and continued moving.
I may need the save(s) from after it loaded supplies at CT and entered the map. As I may need to backtrack when the TF changed destination/off-map mode.
Did the TF say "Off Map" for the first time on the 17th, or had it been saying that for several turns?
- If for several turns, I will also need the end-of-turn save from immediately before it first changed.
- If this is the first, then I will also need the end-of-turn save for the 16th.
I need to run the turn and trace why it changed to off-map movement pending if it was already on the map.
PS what game version are you using?