Why does the light gray ghosting or blurring appear when taking photos in a backlit environment?

This occurs because, to achieve a more dynamic range, the phone activates HDR (High Dynamic Range) algorithms. HDR works by taking multiple frames of the scene at different exposures and then combining them. However, detailed textures such as hair or leaves can cause issues if there is any slight movement during the capture. This can result in the misalignment of these details in the multiple frames, leading to the appearance of light gray ghosting or blurring.
This is a common phenomenon with all phones using multi-frame HDR algorithms and is not a quality issue with the device. If you find this effect undesirable, you can try turning off HDR or adjusting your shooting angle to minimize the occurrence of such ghosting.