I'm not sure if this is a bug, intentional, or just the RNG messing with me.

I'm playing an orc druid on R57, and I've found about 10 spellbooks of Divine Wrath so far compared to 5 books of other spells.

I have generated a few other books, but the knowledge I get from them is very low--even spells like Cure Light Wounds and Dispel Undead. I'm 13th level, I have a Learning of 15, and I can't get these spells over 100.

Reading the spells Light and Cure Disease gave a more normal number of castings.