I had that problem in version 3 but once version 4 rolled around it stopped happening, always try to stay with the most recent update.
So after I laid out my huts I wanted to move some around but when I deleted a hut with a folk in it the hut got deleted but I still couldn't move the folk. My bot still fed him even though he wasn't attributing to the overall folk/happiness count.
I have a theory that they will be used for better bots.
if you're holding a bot and attempt to reprogram a different bot you lose the bot you're holding but it stays above your head.
