Oh my! Yes, I remember changing the table and other furnishings after some update. Wow. That brings me back xD
Anyway, thanks again for the help. I'd be nice if you could recreate the bug, buf it it was indeed caused by stacking interactions together... Do you play the browser version? I have no idea why, but it's been known to let you skip entire lines of code if you click through cutscenes too fast. One player managed to retain the no clip/collisions off state after a cutscene had ended, and so phased through buildings in the whole game, but never managed to replicate it.
Well, right now my theory is that a similar thing is happening to you. The issue remains that the bed isn't supposed to mess with your characters' exp either way, so it's hard to tell what the culprit is. Maybe it's one of those crazy bugs that happen in pokemon where you can change parameters from one section of the game to another (like using an item ID for a pokemon), but at this point I'm just putting a tinfoil had on xD
The hunt still remains though. But thank you again for your effort!