villager not leaving

okay so its a little more complicated than the title. i had whitney for a very long time and i wanted to get rid of her, i time travelled for AGES ans she never once got a bubble. the only way i got her to leave was to have a campsite villager replace her. NOW that villager, punchy, wont leave either. he isnt the most recent villager, ive gotten at least 3 new ones since he moved in. and he still has never got a bubble. this might be really dumb to ask but is this some sort of glitch or something