Some are shy eaters or homebodies some will eat in their enclosure other's wont (like my BP) finding out the feeding routine is also important. This is in my opinion across the board with many reptiles and other animals. For example my BCI is a distracted eater if she sees anything while she is constricting she will let it go and investigate, while my Bullsnake will only eat if she is hidden. Once they get accustomed to a routine they tend to stick to it.
I've even heard of some refusing a rat with a certain colour of fur.. some snakes are weird..
Good Luck!