Yeah that happens with some strain. But believe me the bud is growing a lot, density inside of what you see it’s increasing, most people focus only on trichomes because thats what they’ve always been told but the overall shape of the bud, how the leaves look, The hardening/swelling of the Calyxes and the amount of water the plant drink are better and more accurate indicators of maturity. Once you see the flower is done then you see if you want to wait for trichomes to mature some more. And even when amber starts to appear and trichomes look mature most likely the strain is naturally inclined to have much more ambering by the time they are ready, like some heavy indicas or Low grade hempy weed. Just my experience anyway.