cosmetics or bug 
This is expected.
You have 4 cores:
And the load is above 4:
Resulting in more than 100%.
If you position your mouse pointer on the CPU information, you will see the details, like this:
I concur with @rdwebdesign. That's the way CPU percentages are typically computed but then they are capped at 100%. We simply don't cap the value so you can see what is really going on.
Why does it matter? Well, running a system at 100% CPU isn't great but exact 100% means everything can still be computed in time. If your percentage is above 100%, processes with lower priority get less time (probably not enough). If this situation continues for a long time, the system will slow down to a crawl and eventually freeze.
Hence our decision to not hide the fact that your CPU has more to-do than it can from you, letting this number surpass the 100% "barrier".