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Could you please post a screenshot with the pertinent Panels (Toolbar, Layers, Channels, Options Bar, …) visible?
What are the image’s Color Mode and bit depth?
What is the metadata-setting in the SfW-dialog?
Can you provide one original file and the resulting jpg/png?
If using save/save as then bloated metadata could be a factor:
However, the various export options should remove such metadata.