This problem is caused by the HDR camera settings. To avoid encountering this problem, please turn off the HDR camera settings when shooting videos on your iPhone.

On iPhone XS, iPhone XR, iPhone 11 models, iPhone SE (2nd generation), and iPhone 12, go to Settings > Camera, then turn off Smart HDR. Then from the camera screen, tap HDR to turn it off or on.

On iPhone 12 models, iPhone 13 models, iPhone 14 models, and iPhone 15 models, to turn off HDR video recording, go to Settings > Camera > Record Video, then turn off HDR Video.

For videos that are already shot and ready for editing, you can send the original files to support#flexclip.com (replace#with@), and then we'll help convert.