Simply checking out cdnjs results in a file being modified because you have https://github.com/cdnjs/cdnjs/tree/master/ajax/libs/Sortable and https://github.com/cdnjs/cdnjs/tree/master/ajax/libs/sortable. It's not just my fs though, it looks like you own site can't handle this (search for "sortable" and you see the summary for Sortable but view the page and it's sortable).

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