Put the summary of the bug you're having here
Duplication glitch for minecraft 1.4.7, 1.5, and 1.5.1
What I expected to happen was...:
After the game reloaded, there would be no items there.

What actually happened was...:
After the game loaded, there was another stack if items between the red stone torches.

Steps to Reproduce:
1. Put down 4 Red stone torches, leaving 4 blocks in the middle.
2. Place the items you want to duplicate in the middle, between the red stone torches.
3.Then do things to make the game auto-save (chop down trees, craft, ext.)
4. After the game auto-saved, then grab your items, then leave the game.
5. When you log back in, the items will be in your inventory, and between the red stone torches, making it doubled.