I am unsure this is a bug or is as intended, but I am posting in here because of impressions I was given.
It was said that Monster Hunter spells will work like Assassin spells in terms of progression and casting -- however, unlike an Assassin, my test character is unable to have more than 3 spell slots of the 1st and 2nd spell circles, 2 spell slots for the 3rd, and only 1 for the 4th, at 10 levels of Monster Hunter and 14 Intelligence. Were this an Assassin, they would have 4 spell slots in the 1st and 2nd spell circles, 3 in the 3rd, 2 in the 4th, with the same intelligence score and 10 levels of the PrC.
If this is intended, please disregard.