Mistake in ride results

Last evening 19:15 EST, I rode the La Bicicletta “Bella Bici” ride, finished near the the bottom of the group but was placed at the top of the leader board. Looking at the new feature which shows the exact route taken, I notice that my route has extra kilometers at the beginning of the ride compared to the others in the group. Now I did go on an early ride to warm up for about 10 min and then joined the official ride at about 5 min to go to the start. Is it possible that the program added those extra km to my total for the 45 official minutes of the ride? That might have put me at the top of the leader board if the program thought that I rode those extra km in the 45 minute time limit of the official ride. Could there be another reason all altogether?