Cooldown Reduction Bug

While playing on my smurf, I realized there was a cooldown bug. I had 5% from Sorcery, 15% from Lucidity, and 10% from Youmuus. However, my stats showed I only had 20%. It might be a display bug, but when I got Blue Buff, my Cooldown went up by 10% and wasn't fixed and recalculated to 40%.

Link: http://imgur.com/T62OOvQ