WTF'S burrowing?

[Lanky]

Set up is a exo terra 18x18x24 in as a temp cage till late oct
3 water dish one big shallow one and 2 smaller one
Feed crickets small to mid size daily
Sprays cage with water twice a day
70 watt infered bulb and lamp
3 fake vines with leaves in which they sit in
One log hide that is vertical
Another branch vertical in which the bigger ones sit
All 4 of the WTF'S are young about 1 in to 2.5 inchs i have 3 bit bigger one and a small guy all gotten at the same time same store

I've only noticed one of the treefrogs burrowing and it was one of the bigger ones and it was mid day.
Any reason i should panic or go ahead and keep what im doing? / is it normal for them to burrow?