Your files are not unstaged (although I can see why you'd think that). You've got your filter set to show ALL files, and for whatever reason, SourceTree lists the clean files in the unstaged list (really, they are neither staged nor unstaged, but if you want to see them, they have to go somewhere).
Switch your filter from "All files,..." to "Pending files,..." and you should be good.
Supported Platforms macOS Sourcetree has a lot to offer and, like many developer tools, finding and using it all can be a challenge, especially for a new user. Everyone might not love ...
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