Why don't my bunnies eat treats?

I have two bunnies, a lion head female 2 year old, and a 10 week old jersey wooly male. they don't eat bunny treats(carrots, banana slice, etc.) i put treats out for them and they won't eat them. They just sit there. They'll eat them when I go away though. But sometimes if I just put some in their cage the boy will eat a little. I've never seen the girl eat. I've had them for about a month. I play with them all the time and socialize with them and stuff, I've never been able to play games with treats with them though... Thank you(: