Brand new Mavic 2 Pro and i have noticed the horizon isn't level sometimes after take off.
It's a pain when filming, not so much when taking photos as it can be fixed in post.

Why does it do this?

Usually caused by not taking off from a level surface, not calibrating the gimbal and even if those boxes are ticked a heavier wind speed can cause minor tilts. The M2P has one of the best gimbals for on point horizons that I have used so calibrate the gimbal on a level surface at home and see if that helps. You can also manually adjust the gimbal tilt angle in flight if required. Also using third party ND filters with heavier frames can cause this.

Hi, thank you for bringing this query for us. Can you please try to calibrate your gimbal thru the DJI Go 4 application to see if the problem will still persist? Also, please make sure that you already calibrate the IMU of the drone and you are using an updated firmware. Please keep us posted. Thank you!