User blog comment:Kelerik/2014-06-26 4 Million Users Campaign, New Cards/@comment-116.86.48.71-20140626080518/@comment-24949969-20140626080758

It's either that or 2.4 is horribly bugged. I have two UR buffers with one being lvl 1 skill and lvl 10 skill both have same proc rates and same amount of % increase