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Hi [USER=143952]@LyssaTalbot[/USER]

If you send a link to the full-size PSD file on a file-sharing service (e.g. Dropbox or otherwise) I am confident the root cause could be quickly determined. 

There are a number of known cases with fine patterns in original full-size files that will cause strange behavior in Photoshop due to performance speed tradeoffs when displaying especially at lower magnifications.

The same issues can potentially manifest when saving as well.

I am guessing that this is the issue as I saw hints of that problem after extracting out the transparency of the foreground image.

This test could also be done on a cropped portion of the image at the full original resolution.

Just a suggestion

John Wheeler