Game glitching when crafting more than one item using custom materials at once

So I finished my first attempt at a mod yesterday, and I added new items, blocks, crafting recipes etc. I have 2 kinds of recipes: One using vanilla materials, but making custom items (a new music disc), and one using custom materials (items I added +end crystals (vanilla material)). Now whenever I add more than 1 material per slot, in the crafting grid, and shift click the crafted item, I only get 1 in my inventory and I can no longer interact with any block that has a right click function (chest, crafting table, etc) also I noticed that some bunnies nearby had stopped moving altogether. Crafting the item one at a time seems to work but as soon as I have 2 in my inventory the same thing happens. I have checked multiple times that the items used have no procedures to trigger, or attached to them. Stack size of said items is 64, so no issue there. Both types of recipe I tested My MCreator version is 2025.3 (latest one) and the mod is for NeoForge 1.21.1.

I also exported the mod and tested in normal minecraft, and the same thing happens there.