I've been flying a P4P for several years and do some Sec 107 contract work. Programmed Litchi to fly a grid over a 20+ acre site at 375 ft taking about 12 photoshop stitchable images to create birds eye view composite of the site. Have heading set at 0 degrees and camera angle at -90. The first image in the sequence is attached image and is skewed 15-20 degrees east of north as were the ones as the bird moved east. The road on the left is North South. The bird icon in the Litchi screen was pointing due north. I calibrated compass right before the flight. From what I've read Litchi seems to be a very reliable and stable platform and I've had no problems programming it. I suspect it's my error; can anyone help? Thanks.