Well that is odd..
We are in the entrance to the underdark.. went to rest, and 3 returned where they should be but One went to the Putrid swamp.. And.. Yes.. I Think that was the last place I used him before going to camp, and leaving him there.. hours ago..
Just picked him back up from camp.. and apparently, he wasn't done in the swamp.. Oops.. wee big buggy..