Double machine guns = No deck gun? (TMO bug)
 

My Tambor got a refit about 8 patrols in that added an extra AA gun, but for some reason now, whenever I call my men to battlestations, nobody comes to the deck gun.

The deck gun exists on both the repair log and I can see it on the bridge of the boat, but there's no slot for it in crew management, and the only way to use it is to shoot it myself, albeit with extremely slow reload times.

Is this a common bug? I'm running TMO + RSDP btw.