Enchantments on items disappear

I had a enchanted fishing rod with unbreaking 2, luck of the sea 2 and lure 3. With that fishing rod in my inventory, I took another fishing rod to enchant.In the enchantment table i selected the original fishing rod. The black screen over items which are already enchanted disappeared on the enchanted fishing rod.
Then i backed out of the enchantment table to check what happened. My original enchantments had disappeared!

Device- Samsung Galaxy Note 2 GT-N7100