Butterfly - wind outdoor (01_0_outdoor_airflow) strange simulation result

HI guys, here my results from the 01_0_outdoor_airflow file that i used as template to make an early test for the outdoor CFD.
I found a similar post from 2018 and i thought to make a new one. I had some installation issues which turned to be sorted. The plugin runs smoothly but still the result look not the same as in the template video

here my result almost at the end of the simulation (552 iterations)

as you can see the pressure on the exposed side of the obstacles is very neglectable. Any idea why?