Shulker boxes are acting up

I have an iPad min 2 and it's running iOS 11. The shulker boxes are acting up. I place the shulker box down, put items in it, and break it with my pick. I collect the shulker box and then open my ender chest. I try to move the shulker box and it does not want to move anywhere. It stay in the one slot in my hotbar.