Wrong CPU Percent Load Calculation via Linux Agent

Hello THWACK members, I have a little misunderstanding on CPU Percent Load calculation.

I have this following issue with one of my environment's machine on CentOS, polling through Agent and default Orion CPU & Memory poller. Top CPUs by Percent Load shows what it has 100% peaks from time to time, but in reality if I used htop, I see what load average is very high and system is overloaded, but CPU in Percentage not increased the value of 60%, Orion displays 100% Utilization. 




How Orion default CPU & Memory Poller calculating the value of percentage loading on Linux systems?