I've only had my baby BP for about a month, but I don't think that's anything to be worried about. Especially if you have a tub with an opaque lid/cover; I think that makes them feel secure even in the non 'hide' parts of the cage. Like they're always hiding a little bit.
After mine got used to her new home, she alternates between sitting in her hides, in the cool spot, in the warm spot, on top of the hides, ect. from day to day. But she's always curled up and resting when she does this. I think something bigger to worry about would be if they are out and active during the day. That might mean they are uncomfortable or hungry or something.