They were probably afraid to jump down for not being sure of the bedding on the floor.   They will get used to it in a day or so.   
My Littles did that as I switch bedding according to the seasons. Sawdust for summer , flakes for winter. They are fine now and don't care what's on the floor.
	
		
			
		
		
	
				
			My Littles did that as I switch bedding according to the seasons. Sawdust for summer , flakes for winter. They are fine now and don't care what's on the floor.
	