Why on earth is Camera automatically zooming my videos?

I'm using iPhone 13 Pro Max. When recording my golf swing (tried both slow-mo and normal video), the camera *automatically* "zooms in" after I've swung the ball. Sometimes it keeps zooming in after each swing. Sometimes it zooms out after a swing. As if it's trying to add some kind of sports effect. When I end the video, I notice that the focal length has changed. Has anyone else experienced this?

I'm using the regular iphone Camera app. AFAIK I didn't fiddle with any settings.

I am SO...

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