First of all - this is one of the best games out there today and ever. Thanks for making it. Really, thanks.
I think I found a bug in the game. I found a Taurog shrine, and I only had 3 free tiles around me (place for only 3 items).
I used all 4 boons, and when I got out of the worship menu, I saw 3 items around me in the tiles that allowed item spawning. My 4th item wasn't anywhere to be found, but I did lose piety for purchasing it, and also I now can't buy again or access the 5th boon.
Basically, since items only had 3 tiles to spawn on, my 4th spawned into a limbo or whatever.
I guess I'm not the first to tell you about it, but just in case.