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Forgive me if I've repeated what you have tried already. Have you tried resetting your household or town? Another way to "reset" the household is to evict them and them move them back into their house. Link below tells more about it.Reset Town, Individual Sims and/or Evict Householdhttp://www.carls-sims-4-guide.com/forum/index.php?topic=20732.msg401812#msg401812
I've only played with vampires a little bit, but the moodlet does expire and may have an effect on their learning things. So it may be normal. They do learn faster at night due to them being night creatures
Sure go ahead and try it. It's been a little while since I've played with a vampire. So it may be possible that they are learning - skill bar does go up, but way slower than if they were studying at night.