Villager Profession Switching

Note this is on Bedrock Edition 1.14.1, I did Xbox and this is my first report so I'm not sure if it means Bedrock Edition on Xbox or Console Edition. So in my village I have a sorting system that has the villager profession's first letter and then a number after it. I have noticed that my level 5 Priest (AKA P001) and my Level 5 Stone Mason (AKA SM001) have both become level 5 librarians while still keeping their names the same.