nobody, that would be a bug. I've noticed the settlement residents not displaying in the settlement correctly at the moment. I haven't figured out why it happens, or under what circumstances, but I've seen it happen quite a bit. Have you tried looking at the settlement resident menu, to see if your guy is technically a resident?
Main Menu > Planning > Settlement > Residents, or something like that to see a list of everyone in the settlement. If your character is still there (the one with used upgrades, I presume), there's a way to get him out, someday. It'll right itself soon enough.