Custom Set Duplication?

This app is a godsend for all 4U players. Literally everything is there you need, whenever you need it. Just one bug/problem. Despite the option being there, I cant make a copy of any of my mixed sets, but the button to do so is right there. I dont know if this is my IPad or just a small bug, but it doesnt hurt the app in the slightest. Just a small inconvenience.

Skyar about MH4U Database