Drone starts to go up in position mode with px4flow

Hi guys,

I’m trying to get my drone (a quadcopter with px4 equipped with a px4flow) hovering at a stable height in position mode however after a couple of seconds after the take off, it starts to go up and it does not respond to any command (lower the throttle does nothing). I Have the same behavior with the altitude mode.

log1
log2

I had upload 2 different logs because in log1 I’d changed some parameters.
Have you guys any advice? I’m new to this world.

Thank you in advance