No idea. Do you usually see a few visitors to the domain? The multiple clicks at Parked are not all that unusual, as they do give you credit when visitors click multiple ads. Hopefully its not click fraud by someone trying to get you in trouble.
Parked.com does have some excellent stats that might help you figure out where in the World the visitors are coming from. Login and go to Traffic Analysis ( https://secure.parked.com/account/reports/traffic_analysis/ ) then enter the domain in the box. You can see referrers and what not.