I have to agree with others, they just need to feel safe and given enough time and routine they will come out of their shells.
I talk to mine, they know foods coming, but now they hear me coming and wheek for their food before I've got the key in the door. It's probably your own internal driver that wants them to be all cuddly right now, and that's perfectly natural. Keep talking to them especially at feeding time, they will get use to the routine and eventually associate your voice with food - their favourite past-time.