Max HRs are estimates. It might be error on the sensor. It might be that you're getting in better shape.
Max HR is a bit misleading, anyway. While it's true that the higher you can get your HR, the faster you'll be, what really matters is blood volume moved. It's entirely possible for someone with a bigger heart that can't beat quite as fast to beat someone with a heart that beats faster but moves less volume.
Take it as a good sign.
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