NBC complaint: The Preakness

I live in Oregon and my sister lives in Northern California. Every year we view the Triple Crown together on Television as a sort of fun tradition. Yesterday we watched the Preakness Horse Race and realized that our programming was not in sync. We were both watching NBC but we soon realized that she was well in advance of what I saw. We thought it was just a fluke until we realized that she was far ahead of what I was viewing. My NBC station had many more advertisements than hers. The horses were entering the gate on her TV while on mine the jockeys weren’t even on the horses yet. As it turned out, she viewed the race some Fifteen Minutes before me. What the heck. This was the first time that has ever happened. Yes, she is sometimes a few seconds ahead of me. But, fifteen minutes??? We are hoping to see the Belmont Stakes together on June 5. Is this going to happen again ? The whole point is to see it together. Isn’t this live programming?