In this screenshot, the number marked in red has an icon. Is this a Incoming or an outgoing call?
See the little phone icon (with the arrow going out) next to the number? That indicates it was an outgoing call.
An incoming call will have no icon.
I can't tell you how the call was made. Even calls that contain errors (mis-dialed numbers) will be in this list so maybe it was someone calling the wrong number?