Dye released by one item can affect others in the same wash without an appliance malfunction. A new coloured garment or an unsuitable mixed load is therefore relevant history.
Understanding this situation
Temperature, textile instructions and prior colourfastness information matter. The washer does not guarantee that incompatible dyes remain separate, and a colour-catching accessory is not universal permission to ignore the garments' care requirements.
A useful next step
Keep affected items and the wash details, and follow fabric-appropriate guidance before attempting stain treatment. Avoid mixing chemicals to reverse the transfer. If the concern is new dark debris or grease-like material rather than dye, describe that different appearance accurately.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.