Well if your temps and humidity are bang on and the snake has the choice of two lovely snug hides then maybe it just wanted to go check out the pile of aspen. Sometimes we can and do worry a bit too much about our snakes doing anything "out of the norm". Fact is they are living creatures with a limited but working brain in there. They are going to do things occasionally that make sense to them and none to us.

Keep an eye on the situation, as long as the snake is thermoregulating appropriately and your husbandry is dead on...personally I wouldn't particularily worry about it.