Whatever I do, if I create an artboard in illustrator that is 540 x 540 pixels the artwork ends up being 2254x2254 when directly exported to png from Illustrator. I even just created a new AI file again at 540x540 pixels, then created a 540x540 filled box and aligned it perfectly on the artboard. Exported to PNG, bang its 2254c2254 again. Why is such a simple task so hard to achieve!?