Alright, so it started with me making a stone axe to chop an ugly oak tree, so I set off to go get a branch, and some rocks. I decided to make a lean-to to get LP while I was making the stone axe, so I grabbed bough. I decided to make the axe and then finish the lean-to, and when I crafted the axe it did not use the branch, but instead used the Elm Bough I grabbed.
Is this intentional or is it a bug?