Problem with maximum spells per level

According to the manual, the intelligence of spell casters determines how many spells they can learn for each spell level. In the attached save Nalia has learned 15 level 5 spells and 17 level 6 spells. Nalia's intelligence is 17, so her limit is 14 spells per level. Is this a bug or am I missing something?
Post edited by Alonso on
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After the potion wears off you don't forget those spells... it's a 'workaround' for mages to learn more spells than their base intelligence allows.
I usually wait until I have quite a few unlearnt spells and then chug a potion, and add them all in one go.