Ran into a bug today—at least I think that's what it was. Rendering an image that has a background plate in it. The file size is big enough that Keyshot wants to render it in two tiles. When I render with CPU, all is great. When I render in GPU, KS moves the background plate up in the frame so the base is the same as the top tile. I usually always render with CPU (3970x) but somehow that got reset today and it decided to use GPU (2080ti) which is what I preview with as it previews faster when setting up my file.
Thank you for reporting this. I was able to reproduce it. We will fix it in the next version.