One of mine sits half out of his hide like that when he's hungry. Since he has spider gene, he actually wobbles around in the S position and looks very intimidating. I can tell it's because he's hungry because he wobbles when he's hungry and is perfectly still when he's defensive. When I move around he gets excited and thinks he's going to eat, but that just translates into a 'scary' behavior (erratic movement, 'tracking' me back and forth, sometimes striking the cage). I thought it was because the scent of the rat was on the paper towels, but he does it even if I change them immediately. The only time he doesn't do it is when I'm feeding him very aggressively. He's basically just a fatty.

I can still pick him up when he's like that and he's perfectly fine to hold, by the way. When I first reach in if he looks like he's going to get too excited and try to eat my hand, I touch him on the side with a paper towel roll to show him he isn't getting a rat.

I ONLY noticed this behavior after I started feeding him in his enclosure, so if it bothers you too much you could consider feeding separately to see if it makes a difference.