[Lwjgl] Partial transparent texture on Voxel don't render correctly (SOLVED)

Hello everyone,it’s me again for a small but annoying problem. I currently try do make a voxel engine, everything is going one more or less well but globally it’s fine.

One of my problem is that i have a leaf texture which is of course transparent in some point but when i render it the transparency only apply for the current chunk (161616 group of blocks) which the leaf block is. And for the rest its the absolute nothingness.

A picture will explain this more :

http://image.noelshack.com/fichiers/2014/34/1408828374-leaf-prob.png

In render each chunk in an interleaved VBO and i have enable BLEND etc…

If anyone have an idea of what’s going wrong so i can try to fix it, i’ll be glade. My opinion its that i draw the leaf before the other blocks so when the transparency is enabled there is nothing behind it, but i really wishing i’m wrong.

P.S: sorry for my bad english, it’s not my native language.