Using extra_model_paths.yaml can cause checkpoints to be listed twice

[kaptainkory]

LoRA Manager Version

• Version: nightly [0.8.21]

Environment Information

• Operating System: Linux Mint
• Browser & Version: Chrome

Issue Description

• My checkpoints were showing up as doubled (two icons for every different one). Upon troubleshooting, I discovered the issue comes from using extra_model_paths.yaml with particular settings.

Steps to Reproduce

1. Enable extra_model_paths.yaml.
2. Set BOTH "checkpoints" AND "diffusion_models" parameters to the same source folder.
3. This "duplicates" the models in the lora-manager. (They do not register as true duplicates when checked by hash.)

Expected Behavior

• Models should not appear doubled by these settings.

Additional Context (Optional)

• My extra_model_paths.yaml file looks like this, in part:

comfyui:
     base_path: /aiart/
     is_default: true
     checkpoints: chkpts
     diffusion_models: chkpts
     unet: chkpts

• Oddly, lora-manager doesn't show the models in triplicate (even though I have three parameter "folders" pointing to the same source), but it does duplicate them.