The "tick" on the skill bar that is third from the end, can be either Adept or Master. The change from one to the other happens in that range, so it is possible for an Adept Villager to look like he/she has the same skill level, but isn't quite there yet.
When I see that happen, at least I know that it is getting closer to Master level (and Elder level if it is the third Master.)
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