The feat Esoteric Spellcasting does not work properly. The first time it’s taken it grants the 1st level spell, but heightens it to 3rd (which it shouldn’t), then it never grants the 2nd or 3rd rank spell at 6th and 8th level, respectively. Furthermore, the greater version immediately grants the 5th rank spell, but not the 4th rank spell.
I think there’s an error in the greater feat, btw, since you can’t take it till 12th level and it says “You also gain a 4th-rank spell of that tradition as an innate spell you can cast once a day. At 12th level, you gain a 5th-rank spell, and at 14th level, you gain a 6th-rank spell, both of the same tradition.” Which doesn’t make sense since you’re already 12th level - my suspicion is that it’s supposed to be a 10th level feat. But that’s on Paizo.