What's wrong with the mod
When using copper tools, the durability will span across the entire screen over the rest of the items in the inventory.

What Minecraft Version are you playing
1.20.1 Fabric

What version of the mod are you using
2.1.1

it works now thank you!

Thanks for reporting the bug. Will be patched in the next update.

The update that's supposed to patch this bug has been released (Version 2.1.3). Please let me know if the bug persists.