Hello mod maker, I have found that in combination with certain mods your mod causes item duplication in the players survival inventory crafting menu when shift crafting.

Mod Folder

I am still working on deducing what other mod installed is causing this. But the duplication behaviors goes away when I disable your mod. I will let you know if I find out what other mod installed is causing this behavior. I am in 1.12.2 forge 14.23.5.2847. I hope you decide to look into this as well, as I am fascinated by what could be causing it. Attached I have sent a video of the behavior described.