ReadPixel working in windowed mode but not fullscr

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Dax Trajero
 #1
Both ReadPixel and ReadPixelFast are working fine in windowsed mode but return the wrong values when working in fullscreen mode

In fact, the values returned in fullscreen mode don't correspond at all with any colours used on the .png file at all.

The colour should be FF005F1C
The colour returned os FF005C18

I've checked the x,y values and these are fine

Any ideas ?