I honestly don't think you have anything to worry about here at all... your humidity doesn't pose a problem and even then, bud rot doesn't start to show up in the pistils.... Relax - you're fine!
Good luck!
Hey Growmie,
No this is not weird at all, your pistils are maturing, the amber color will eventually move from the base and the whole pistil will be this color. You have nothing to worry about at all, just keep enjoying your grow.
My question would be what is your humidity running. It looks like how bud rot starts and progresses. If it has been over 60 percent you may be in for bad results very soon.
either age/environmental or pollination. See any nanners around? A good reason for an inspection if you don't regularly do so.
4 weeks into bloom is a bit early to see coloration of pistils, but not unheard of, either.