05-30-2019 03:14 PM
@おたわけダイバー - This is often an issue with the playback settings on the iPhone. Be sure the slow motion function is turned on for your videos. If that's not it, it may be an issue with how your iPhone is processing the file. For example, larger files or some resolutions may be harder for the iPhone to play, making it look like it's in slow motion.
To check if it's the iPhone or the video files themselves, try moving the video file from your iPhone onto a computer to see if the video plays normally on the computer.