So I've been working on a custom resource pack for a long time now, and I've recently started applying 3d models to certain blocks. I've remodeled the cauldron and the enchantment table, but I'm having a problem with the enchantment table. The model works fine when I place it on the ground, but it doesn't behave correctly in the inventory.

Here's what the model looks like on the ground:
https://i.imgsafe.org/e2b9291998.png

It seems perfectly normal; here's what it looks like in the inventory:
https://i.imgsafe.org/e2c37c20f8.png

That's weird on its own. It doesn't have the isometric view like all the other blocks.

It gets really weird when you hold it:
https://i.imgsafe.org/e2cbb459d0.png

Originally, the model for the block caused the diamonds to pop out out the hitbox. I figured that this was the problem, and the game didn't like that the model didn't fit the hitbox. I changed the model to what you're seeing in the images. I have no idea what's causing this and I have no idea how to fix it. Please help!