Villagers Resetting Their Experience Levels But Not Really???

• I've been living in a village (and rarely venturing outside of it). It's very fortified and lit up because I am a weenie.

• I had one Master librarian, with one lectern job site block. Just chillin' living in his house. We traded like every day and were besties 'cause he had nametags.

• Logged in today, librarian has reset back to Novice, (and now has a different trade options). Frustrating, but okay. Whatever. I thought, maybe it's a new librarian?

• When I trade with him, his experience goes up still as if he is an Expert. Like... snail-pace experience bar for the low level trades that are now his only offers.

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Maybe related: I have one job site block for shepherds and like 3 shepherds. Is that supposed to happen? I hate shepherds but I like my loom. I should lock up that loom.

Idk man, I wanted to invest in my village but it's frustrating.