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It happens a lot, a method I've not used is a strong magnet to find the screws/nails holding the plasterboard to the stud. Try a little pilot hole in the middle of your 'area' to see if you hit wood if you don't have a small strong magnet to hand. My stud finder has a calibration feature, when you turn it on you have to keep it a metre away from any objects, you could just be picking up a faint signal from the stud out to the edge of your area, or you're on a cross piece which would be a result, try going up and down. The stud should be around 2 inches wide.
Airhead
Question for the hie mind: I want to hang a heavy mirror on plasterboard. I've used a stud finder, but this suggests there is more of an 'area' than a 'line'. Does this make sense?