Bud rot problem.

Hi all! I'm in the final week/s of flwr (indoors) and have two colas that have some, I believe, fungus problem. Here's the symptoms: Two buds have recently turned brown on me.
Not the whole cola just 3 inches or so. Not powdery mildew looking, they just, and very quickly turned dry and brown. I cut the affected parts and haven't seen this "browning" affecting the lower part of the cola.yet. Nor any other plants.

All the other buds look fine. Weird! The browning and drying was super fast.

PLEASE any thoughts on this?? This could get scary, I need to nip this shit in the bud! Before is preferred

Thanks~

Have you been checking your RH max and min? you could find the answer there. Right now I can tell you to invest a bit on improving ventilation. Sulfur Burners are said to be good to fight this kind of issues too. Btw you did the right thing cutting the affected parts. Best of luck pal.

if you cant get a dehumidifier then blast big industrial fans on them.