To me it looks like the standard overexposure warning “zebra” lines. They can be disabled in the app if desired, but they do serve a purpose. They don’t appear on the recorded media. It’s your choice to keep them visible on screen or not.
Those are the overexposure lines. Will help you see what areas of your image or over exposed. If you do not want to see this go into your Camera settings and turn off the option for overexposed. These will not show up on your video but most people do not like seeing this while flying or filming. It’s all preference.