Hello there. Orange bud, not pistils? Let's talk about it.
Firstly, plants look great and you're coming up to the finish line here. Great job👍. There's not a picture of the orange bud you mentioned but I do believe I know what you're talking about. If you were able to add a photo of what you're seeing, that may help us question answers a tad more, but let's just talk on what we know and your current environment.
A bud starting to turn orange may very well be a localized anomaly of the plant. If this is the only area you saw the dis-coloration, then I would not panic one bit. Some of our plants can act funny near the end and in no way, shape or form (according to the environmental numbers) do I believe this is bud rot you're looking at. I believe this is a simple phenotype and/or random mutation/anomaly. You didn't do anything wrong by chopping her (you were taking a precaution) but it may have been nothing at all. Your temperature and relative humidity readings are on PAR and these conditions should not start a bud rot scenario ( SHOULD NOT! lol). You're running 25 degrees and 40%, that is optimal. Once we go into the 26+ and 60%+ RH territory should bud rot become a possible issue.
If you're concerned with this dis-coloration/issue and your gut tells you something is off (possible bud rot starting), I simply suggest dropping your temp and RH (23 degrees and 25-35% RH). At this stage of flower, the lower 25% humidity should not hurt them at all👍 Lastly, air circulation is key. Adding additional fans for air flow will help keep any standing moisture from establishing itself and/or effecting your plants.
Things look great, I don't think you're in bud rot territory and I genuinely feel this may be a simple, localized issue with a simple top. If you can add pictures in the update, that would be great! Until then, I hope this helped, don't panic and all will be well. Drop me a PM if you'd like to speak further. I'll be kicking around😉✊