Calendar app randomly creates new event

My calendar app on my MacBook pro touchbar 15inch 2017 with Sierra on it has been acting weird. Whenever I click on an event and highlight it, then click anywhere else in the calendar app it automatically creates a new event. And you can't delete that new event unless you click on somewhere else and drag to actually create an event.

Any thoughts?

The same thing happens to me. Hopefully it will be fixed in macOS HighSierra, but for now there is no fix.