If you click on your strain it will take you the RQS specs for this plant.
According to them this takes 8-9 weeks to fully mature so you have 3-4 weeks to go still my friend 🤙
Have you flushed them really well & how much are you feeding them it's hard to say really. I've some strains do this. Autoflowers occasionally won't have Amber trichomes in my experience. Sometimes some of them continue to golden after I cut them down.. hope that helps