I did what?

[dlsumpntx]

U10 tournament. I'm on the bases and call several IPs (only the very obvious ones), some which negated a called strike, as you might expect. The coach was fine with it, his team was rolling. However ... my partner tells me after the game that the fans were perplexed and annoyed because, on the called strikes that were changed to a ball because of an IP, they had never seen a base umpire overturn/overrule his partner's strike call.