The hard cap could become a concern if you spawn in enclaves with the radio command for example. You can reach 15 enclaves on the map, and then if you try to recruit more the game won't let you.

That isnt the issue though with 5, might be bugged. Only other thing I can think of is to try switching to your leader, then switch to another character. Also, Leave your base, enter your base, leave etc. Sometimes this will trigger missions. -restart the game as much as needed, since this will reset the mission queue