Why has player indicator colour changed

Play FC24  co-op Ultimate Team on the same console with my my son and a really annoying thing has happened.

On Rivals, yhe player icon colour for the second controller has changed from blue to yellow and I have no idea how to change it back. 

I struggle to see the difference between the lighter yellow for a computer controlled player and the slightly darker yellow for the user (mine) controlled player.

Does anyone know how I can get the blue colour back? It only happens in Rivals and Squad Battles is the usual blue.