Mage spells memorization issue

I'm stumped and can't figure out what is causing this issue. All mages that I've tested so far, except for Neera and Dynaheir, are affected by this issue. This included a dual classed Imoen, Khalid (made him a fighter/mage with a mod), and a test mage that I made and gave XP to using EEKeeper. Ok here is the issue:
When a mage reaches level 5, they *should* be able to start casting level 3 mage spells. Tonight, when I leveled Immy up to level 5 mage, it even said in the UI that she had gained access to one level 3 spell. However, when I go into the memorization UI, there's no empty box there for me to allow me to memorize one. Neera got access to level 3 spells when she hit level 5, as did Dynaheir. I made a test mage and gave him XP to reach level 5 in EEKeeper, and the same thing happened (even the UI saying they now have access to one level 3 spell). Can anyone tell me why? Save is attached.
Thanks in advance.
When a mage reaches level 5, they *should* be able to start casting level 3 mage spells. Tonight, when I leveled Immy up to level 5 mage, it even said in the UI that she had gained access to one level 3 spell. However, when I go into the memorization UI, there's no empty box there for me to allow me to memorize one. Neera got access to level 3 spells when she hit level 5, as did Dynaheir. I made a test mage and gave him XP to reach level 5 in EEKeeper, and the same thing happened (even the UI saying they now have access to one level 3 spell). Can anyone tell me why? Save is attached.
Thanks in advance.
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Comments
Tagging @subtledoctor
Edit: @subtledoctor has addressed the issue below.
Thank you to @Bubb as well for getting subtledoctor involved!
@ArjukKagrim I guess you might ask subtledoctor himself. You can find him on the Gibberlings 3 forums.