Horizontal videos exported into squished vertical videos

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Principle Version: Version 5.10 (5021)
macOS Version: Version 10.15.2
Sketch Version:
Description of what you need help with:
When exporting into GIF/MP4, the videos in the prototype are exported wrong. They are horizontal videos but somehow exported into squished vertical videos.

Steps to reproduce the behavior:

Screenshots/Sketch File/Principle file: (if applicable)