• When you select a item from the creative menu you can see some of them will not having the details about that item. Like a potion you can't see the duration time and the level of the potion in creative menu. Weapons/tools also don't show the attack damage. You only can see details of the item when you take the item from the creative menu and put in your inventory or when you craft a item in crafting table
• This also happens in crafting table (Survival and In the recipe book) 

Device:  LG K10