That is odd .. the green bars are how much the CPU/Cores are being used .. all the way green is 100%. Something has to be set wrong in the BIOS or windows or something to have these CPUs/Cores spike like that.
I noticed that you cleaned the computer recently .. I'd check agian. Shut it off & open her up, and remove any dust/dust bunnies in the CPU heatsink. An overheating CPU/Core could be the cause of these spikes/studders.