How to turn off automatic HDR on iPhone videos in camera roll?

For some reason just for the videos in my iPhone camera roll, they look normal when looking at all my videos together on the camera roll. But once I click into the individual video, an automatic HDR filter is applied to the video and washes it out, and an HDR label appears at the top left hand corner of the video (circled below in red in attached photo). Please see pics attached. Could someone please please help with this urgent question thanks so much !! How can I turn this off and restore my videos to their normal settings ?