When the scale says 80 kg, it is telling you about your mass.
To get your weight, you either need to convert the mass to pounds or Newtons.
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If there is no display on the scale, this could be your problem.
If your scale is battery-powered make sure you have a fresh battery to install and check it again.
Make sure the shipping plate has been taken off the bottom if your scale is relatively new.
Some models have one when shipping to avoid damage.
A digital weight scale is more accurate than the old fashioned needle scales. You have to stand correctly on the scale to get an accurate reading, but just as with any type of calculating machinery, the scale sometimes needs to be calibrated. To test the scale further, weigh some object of a known weight.