Log duplication glitch

Put the summary of the bug you're having here

What I expected to happen was...:
I had 3 jungle logs in my 2x2 crafting grid and shift clicket to get 12

What actually happened was...:
I got 4 planks and when i double clicked on the logs i got 4 planks over and over again in infinity fully usable

Steps to Reproduce:
1. have 3 jungle logs
2. put 3 jungle logs in 2x2 crafting grid and shift click to get only 4 then remove the jungle logs and put back them in the grid 
3. just continue forever