Problem when Action Mode turned on (an over scanning shadow?)

Hi momokoso,

Thanks for contacting Apple Support Communities!

We understand a shadow is recorded in your videos in only one video mode, correct?

Do you experience the same behavior after you restart your iPhone? If you need help to restart your iPhone, this article will guide you: Restart your iPhone - Apple Support

If you're still seeing the same shadow after restarting, check out the additional troubleshooting steps outlined here such as removing any accessories and cleaning your iPhone: If the camera or flash on your iPhone, iPad, or iPod touch isn't working - Apple Support

"Remove case, accessory, or film and test

1. Remove any case, accessory, or film that might block the camera or flash or that places a magnet near the camera.
2. Test the camera by trying to take a photo.
3. Test the LED flash:
   1. Try the flashlight in Control Center on your iPhone or Control Center on your iPad. On an iPhone X or later or an iPad, swipe down from the upper-right corner of the screen. On an iPhone 8 or earlier, swipe up from the bottom edge of any screen.
   2. Tap the Flashlight button .

If the flash works only sometimes, open the Camera app and tap the flash button to choose a different setting.

Contact Apple Support

If the camera or flash still isn't working properly, contact Apple Support to discuss service options."

We hope this helps.

Take care!