The easy answer is "make it one block wider and see if that gets rid of that"; if I was to guess at a glance, I'd guess the room(s) are barely wide enough to be valid housing, so a little wider and they'll be fine.
Also, looking at the room, you may have too much furniture on the floor -- among other requirements, they need a space to stand on at night, and not next to the side walls/doors. I think you may not have that unless the open door is extending the room.
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