I would like to ask if the green tint I see on the background when I take photo with screen flash is normal or no.
Did you take that picture on portrait mode?
If yes, check your filters. It might be that
No it was not with portrait mode. Normal one
A green screen is caused by a damaged or disconnected monitor cable. A damaged cable cannot output blue, green, or red colors to provide a normal view. Therefore, the monitor displays only the color it receives from the cable. An outdated video card can also turn monitor screen totally green.