I currently have an 8 hour 100 power Caffeine buff and haven't drank any coffee in over a week now. At first I thought maybe the icon was glitched but after running my sleep bonus for a few minutes I can confirm it's active. I can see how this would be beneficial but it also has it's draw backs as I don't always wanna be fatigued lol. Hopefully it can be resolved easily. I've been hearing about it happening to a few friends on and off as well.