Faulty image orientation in Prototype mode

I added some images I took with my iPhone to a Figma prototype. They all have a vertical/portrait orientation and they look fine in Design mode. However, when I play the prototype on my phone (in the Figma app and also in Safari), some images get rotated after 2 seconds and show up with a horizontal/landscape orientation.

I read that the image EXIF orientation might be set to horizontal, but I have not modified these images so it makes no sense why some show up vertical and some horizontal in the prototype. Interestingly, this is not an issue when I view the prototype on my computer.

Any help would be much appreciated!

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