Draft in ventilation system

Hello everyone,
we have installed a decentralized controlled residential ventilation from Lunos in our KFW 55 new building.
Unfortunately, even with closed ventilation inlets, there is always a constant draft, which is more than unpleasant given the current temperatures.
According to the construction company, this is normal.
What do you think about that?

The Lunos e2 is also installed in our apartment. Unfortunately, the sofa is positioned exactly between the two inlets. Without a blanket, you can't stay on the sofa in the living area at 23 degrees otherwise.

As with us - ventilation inlet above the sofa. But it can't be right to be freezing in an energy-efficient house.