Why does some of the photos that I take with my iPhone 6 so much bigger than the other photos?

I didn't change any of the settings in my phone as I have been taking one photo after the other. I don't think it is a burst shot either because I do not hold the capture button for long. So I'm expecting all photos to be relatively the same. Some photos even reached 200MB!
I'm puzzled atm… Why does some of the photos that I take with my iPhone 6 so much bigger than the other photos

A 200MB shot? That's very odd. I honestly don't have an explanation for that. Never heard of a pic reaching that size. Even a shot from a 41MP Nokia PureView 808 is about 14MB

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