Recipes that use transformDamage return two copies of the damaged item. Additionally, if you've got multiple copies of the other recipe ingredients in your crafting grid—meaning the materials which are just supposed to be consumed, not damaged—they won't be consumed.

I've tested this without any other mods installed, and using the example recipe from the MineTweaker wiki.

recipes.addShapeless(<minecraft:stick> * 3, [<minecraft:stone_axe>.transformDamage(), <ore:plankWood>]);

So do things work differently in CraftTweaker, or is transformDamage broken by Minecraft 1.10.2? Or is it just me?

Duplicate of https://github.com/jaredlll08/CraftTweaker/issues/107 and fixed.