I am not familiar with LandRover, but that looks strange to me. I would go hunting for some LandRover-specific information to see if there is something unusual with that plug. If LandRover did things totally differently, then who knows what is on each wire...
Assuming the purple wire is in fact pin 1, the layout makes sense for Voltage on pin 1 and the grounds on pins 4 & 5.
What does not make sense is to have something on pin 7 (should be K-Line) without having its partner on pin 15 (the L-Line).
Carloop does not use pins 7 & 15 (not connected), so any signals there on the OBD port will not have any effect on the Carloop. That narrows it down to pins 1, 4 or 5 causing something unexpected. However, pins 4 and 5 are connected together in Carloop, so that limits the effect even further.
One final conclusion: since you do not have a CANbus (which would be on pins 6 & 14), Carloop is not going to work for this vehicle. There is a project that is moving very very slowly to do CarloopRetro, which would do K-Line (pins 7 & 15), but this is different hardware (and firmware) from the regular Carloop.