This started on our server recently. When the trade guild spawn in their turrets are there but detached, making turreted ships useless.
Occurs every time without exception. Players have reported the same for pirates but I am yet to confirm that.
The ships will spawn in properly if the /initiate_wave command is used to spawn the Trade Guild fleet or they are spawned in via the ship catalog.
Ships spawn properly when spawned in individually via blueprints.