In a multiplayer game with my friends I noticed that when I tried to select a group of ships and order them to move, they simply walked 5 meters and stopped. If I did one by one floor, they would normally go, however as a group they refused to continue their journey.
Never had that before, devs would need a bit more info to go on to try to replicate it. Do you have the game replay? Are you able to replicate it? Very curious bug.