IoU is always 0 on the class road

I've tried a lot of things, including modifying the hyperparameters and making some adjustments to the code, but always on LandCover.ai dataset, for metrics like road is always 0, how should I do to fix this?

<img width="925" height="841" alt="Image" src="https://github.com/user-attachments/assets/bd564836-fb62-4998-b348-45ab72336380" />