Caravan matching service

Has anyone else had problems with this service. When using it there appears to be some discrepencies between the data show in the car manufacturers publicity / hand books and that shown by the matching service.

An example. Huyndai i40 1.7crdi 136 Blue Drive, Hyundai kerb weight shown as 1648kg; CC matching service shows it as 1470kg. I have found several other discrepencies but would be interested to know if anyone else has had similar problems?