duplicating items death glitch

when you die in Minecraft you can unplug the computer and it dose not save the death meaing you can play and never die so i did this after being killed by a pilliger in while in water with 29 xp and came back and never died, and had all my stuff. I died about a minuet later to the same pilligers and still in water so i  respawned to see how much xp i got and it was 7 so i unpluged it.When i got back i jumped in my boat and road of for about 30 seconds and came back in my house around the pilligers. i when to sleep woke up and i had all my items but my items were floating in the water were i died before i unpluged it.All my items were duplicated with the same duribility and enchantments.