Hounds Never Leave My Base

So I allied with the Hounds and set a base up in the swamp, and they sent some squads over for defense.

Evidently they liked my base, since I now have a bunch of Hounds permanently wandering around my base. This is obviously great from a base defense standpoint since they can beat pretty much anything that comes by, but I can't help but feel that something broke somewhere.

On the faction screen, it always shows "Base Defense Contract" with the Hounds as expired, as well as "Hounds Reinforcement" as an upcoming event.

Anyone else had this issue? I did some searching but didn't see anyone discussing a similar issue.