How to fix airspeed reading non 0 on my bench?

I have the 3DR I2C airspeed probe, it’s configured as such:
ARSPD_AUTOCAL 0
ARSPD_ENABLE 1
ARSPED_FBW_MAX 40 (m/s = 144kph)
ARSPED_FBW_MIN 9 (m/s = 32kph)
ARSPD_OFFSET
ARSPD_PIN 65
ARSPD_RATIO 1.99
ARSPD_TUBE_ORDER 2
ARSPD_USE 1

I get an airspeed of about 13 on my bench.
If I blow in the tube it goes up
if I blow on the static holes on the side of the tube, airspeed goes up too (that’s wrong, it should go down)

I tried changing ARSPD_TUBE_ORDER to 1 and then I get an airspeed of 0, but I get no speed if I blow in the tube. However if I blow a lot in the static port, then speed goes up.

If I change ARSPD_TUBE_ORDER to 0, I get the same airspeed than order of 2.

Any idea what’s wrong?

Sigh, this was stupid.
I had ARSPD_SKIP_CAL 0
but turns out I had to reboot for the offset to be calculated, and I had not rebooted yet.

After reboot, all better