Summary:
In the Adventure Time Mashup Pack, the Oak Sign and Pigstep music disc item texture are placed one pixel higher than the other variants. The items for the different door types are also placed in different positions and are sized differently. 

Steps to Reproduce:

1. Enter a world with the Adventure Time Mashup Pack applied
2. Open your inventory and look at the Oak Sign item and different door types

Observed Results:
The Oak Sign and Pigstep music disc items are positioned differently from the other variants. The door types are different sizes and are in different positions.

Expected Results:
The Oak Sign and Pigstep music disc items should be in the same position as the other variants. The door items should all be the same size and should be in the same position.