Nearly all of the shots have the horizon tilted to the left. Recalibrate your IMU and calibrate the gimbal. If that does not correct it use the gimbal roll correction to manually level the horizon. Turning on the grid overlay is helpful.
It's my first time using Premiere Pro CC for editing. I'm not that used to the color correction options yet.
Yeah. I realized the tilted horizon issue when I viewed the video at home. I've done cold IMU and gimbal callibration again yesterday.