Tree won't spawn at the sapling place

Hello,

I've created new trees as the fundamental element of my mod. I've therefore created structures (the trees per say), specific wood and leaves blocks, and dedicated saplings to each tree, including the necessary procedures. The thing is, when I make a sapling grow (by right clicking with bone meal on it) it spawns a tree at least at 4 or 5 blocks away from the sapling point. I've tried everything I knew (playing with the offsets) but nothing had came to solve this issue.

Does anyone have an idea?