Are these mycellium trays contaminated???

Hi there. First time posting to this site. My friend Never needed help with mushrooms, but he's hit a confusing bump in the road. In this picture, this 50/50 coir and verm substrate is completely colonized and even fruiting very well. However slowly the mycellium
has started to change to an orange kinda tint. I don't think it's bad because it smells like mycelliun and is fruiting prolificly. Strain is Cambodian Please tell me you input!!!