I have a MacBook Pro (Retina, 13-inch, Early 2015) MacOS High Sierra 10.13.2

Sometimes my mac using a lot of CPU power. The usage is 75% of the system. But this occurred when I was away and the mac was in the sleep mode (I went away at about 11 AM till 8 PM). Also, the "User" usage is used more power than even when it is on. Does my Mac has some problems or is this behavior normal? Can it be a Virus?

I checked the last 30 days. It happened more than ones. They are lasting for about 3 days...