WinterSnowfall: Your data is safe with GOG...
I'd backup my installers if I were you... you know, just in case.
What exactly are we looking at?
A corrupted screenshot that somehow is still used on the game in question's store page?
This has happened before with other titles too, so nothing really out of the ordinary.
The banner images for the news somehow get messed up as well now and then. A more recent example being the No Man's Sky / The Surge collage
, which still gets re-used for sale announcements or when there is another of the content updates to No Man's Sky.