Thanks for your reply. A strange thing happened. A week ago, I was getting a firmware update available message when I flew. I ignored it at first. Then, at home, I did it. It didn't have to download. But it started the install at 72%. I thought that was strange. After that, the horizon seemed level. So for some reason, maybe I had an incomplete firmware update. Usally, I make sure the update finishes 100%, or I do it over. Also, I have a mountain range to the west, so even if the gimbal is level, it looks like there's tilt. But it's really just the natural tilt of the land. When I look in other directions, the horizon seems fine now. That vlogger, OriginalBo, said the latest update fixed his horizon problem too.