What would be different about the family room on the next level down? Presumably that one would be intended for family of patients on the next level down...
It could be they kicked out all but one of the patient's families because they were meeting with that family. I've seen that happen a few times, where staff needs to have a private conversation with the family, and needs to improvise a private meeting space. Usually the family waiting area will have a room set aside specifically for that purpose but not all of them do.
Happens outside of ICUs sometimes, since you can't have a meeting in the patient's room. In that case, the reason they wouldn't have gone to the one downstairs is because often times you don't want to ask the family to move to another floor if their loved one is on the room they're already on.