Prowin HHSJ0002 Variable Angle Mitre Saw

I HAVE USED THE SAW TO CUT A PIECE OF WOOD 68 mm * 45 mm CUTTING THROUGH THE 45 mm THICK SECTION AND IT DOESE NOT CUT SQUARE!! I PURCHASED THE SAW TO ENSURE IT CUT SQUARE. WHY IS THIS!!!??

as described

The saw broke on second use, went out and bought an electric one for 20 pounds more which works a treat.