Thanks! I suggest deleting this file. It is a metadata file created by Finder and not used by Spectre, so it is causing confusion. In the future I will teach Spectre to ignore these types of files.
Since it's a hidden file, you will not see it in Finder. Perhaps the easiest way to delete it would be to open the Terminal app and type this command:
rm ~/Library/Group\ Containers/group.app.spectre/Documents/.DS_Store