Pistols turning amber?

This is my second grow of royal queen special queen #2 (WW strain) I am 18 days into flowering and some of my pistols are turning amber on the tips. DWC, advanced nutes gr,mc,blm, CFL'S. Last time I grew this strain pistols didn't change till late into flowering. Just wondering if anyone has any advice on this. Very few bud sites are showing amber colors while the rest look amazing. Heres a couple pics. First pic with amber, second looking normal, and third of the entire plant.

Looks good and healthy to me.

Im not too worried about it just thought I would share some pics and see what people thought. Oh and just so people can see the difference in nutes and no nuts, the plant to the left was started the same day same everything except never received any nutes. Ive been pushing the nuts pretty hard on the larger plant. I just like to experiment with my plants lol. I think I enjoy the grow more than anything!