You can fix this by:

A) replacing "recipes.addShaped" with "recipes.addShapedMirrored"
B) omitting empty spaces after the items in the grid. So like, instead of [[null, cobble, sturdy_stone], [null, stick, null], [null, stick, null]] for a hoe, you'd put [[cobblestone, sturdy_stone], [stick], [stick] and so if you wanna make it in the far right of the crafting grid, you can.