The sprites for the crockpot UI is visually offset up compared to the actual interactable item slots, it worked correctly one time, and then the offset happened, and it hasn't stopped since.

Thanks for the report. This isn’t a bug with CrockPot itself. In version 1.20.1-1.1.0, the GUI of Crock Pot was updated. The Legendary Edition modpack includes an older GUI texture for Crock Pot, and when that outdated texture is applied to the new GUI, the misalignment happens.

To resolve this, you’ll need to remove the Crock Pot GUI texture that Legendary Edition adds. Once it’s gone, the updated GUI will display correctly.

We can’t fix this on our end since it comes from the modpack’s override.