Hi there Dudders, this is totally normal behaviour , pistills can turn brown for any number of reasons, right? usually it means the membrane got pierced either because of ventillation , humidity, age, etc, plus many of them turn at the chop and during the cure. You have plenty of weeks left if you think about it , the more the plant bulks up the more new pistills emmerge. Plus it's much to do with genetics, some genetics have fresh pistills until the chop , some dont, some even have them after the chop like purple ones with white pistills . In your case you just have to keep an eye out for foxtailling, which is not a big problem at all, after all those buds ar smokeable material too ! You're doing a great job just keep up the good work and see . hope this helps ! 🚀