Nordisk Oppland 3 SI

See this tent on our website:
Compact without compromising on comfort...
The Oppland 3 Si Tent from Nordisk is easy to pitch and easy to put back down. Inside it has plenty of room for three people and their ample equipment. It is the ideal tent if you are looking for something compact without compromising on comfort and the need for storage space.
The aerodynamic tunnel construction adds great wind stability and the flysheet has a large vent at the front and rear which provides optimal airflow, securing an excellent indoor climate when the weather leaves no choice but to stay indoor. The vestibule provides plenty of room for storage and cooking, and can even be turned into an extra living area if used together with the matching footprint (not included).

The Green Anodised DAC Featherlite NSL poles utilise a thicker diameter of pole at the center of the pole length where the stress level is highest, known as Nordisk's Reverse Combi technology, to increase the headroom of the tent without the need for extra poles. The Green Anodising process eliminates some of the toxic chemicals required for the standard anodising process while still achieving a high quality aluminium with a colourful and bright surface.

[ehsansoltani]

I just got my Oppland 3 SI, the website says the weight without the sack is 3300 gr. I weighed mine with the sack about 3800 gr. without is about 3700 gr. Is there any specific reason for the mismatch?