Perfectly normal, some people use it to 'wake' up their pc's, i.e. a move of the mouse fires the machine up. You should be able to disable it in the bios if it's not to your liking, just look for BIOS switch off USB-power-on / USB legacy support.
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This poetic animation about monsters is illustrated in a Van Gogh painterly style
How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.