Iphone video to windows 10 becomes 1/2 split, 90 degrees

Iphone video to windows 10 becomes 1/2 split, 90 degrees after downloading video to W10 PC. The video is OK when played on Iphone, but the same video saved on PC is 1/2 slanted when played.
The video on the right side of the saved video is OK but the left side of the w10 PC is slanted 90 degrees down. There is a 45 degree line going from the top left side of the screen to the right side bottom of the screen.
The video is mirrored left to right slanted

last month I got a video from my nephew he took of his new swimming pool, and that video came slanted/mirrored also. I didn't think much about the video because I thought he had created the slanted video to be funny.
Now it's happened to me.

Is the problem with W10 or the output of the iphone?
 
It's got to be W10 as the problem. I sent the weird video as it recorded on my PC from the Iphone to my nephew. He said the video was perfect, with no split screen or mirror reflection. My PC splits the video.
I took a photo of the video to post it here.
If anyone knows how to correct this problem please respond.
 

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