http://iscoresports.com/

Normally when I score a game, the number of viewers of the iscorecast is 12 or under and I know it's those that I have sent the link to

This weekend we are at a tournament in Aurora and the number of viewers was skyrocketing (80 to 100) and fluctuating significantly - didn't make any sense

Any ideas why this would be happening or if I should be concerned

Maybe other teams at the tournament were watching your game as well. Could be fluctuating as people just check the score real quick. It's common for people at tournaments to check other games to figure out who they will be playing.