Problem with Photoshop transparency file

I made some single layer Photoshop files with transparency using Affinity Photo and Pixelmator Pro.

I make the files as HD 1920x1080 with transparency. I paint something on the layer and export in PSD format.

When I bring the PSDs into FCP, the content of the file is usually offset and not in the correct place. FCP says the file is 1920x1080. I make a project with a 1920x1080 file; FCP gives that as the size. When I put the PSD files in the project, info still shows them as 1920x1080, but they don't fill the frame. They smaller than the frame. Spatial conform is set to none, and the images aren't scaled in Transform.

Could someone try this and see if they are having the same results? I don't use Photoshop, so it's possible the problem is in the graphics application, though surprising that the two are producing similar behavior.

Thanks very much.