By default WordPress adds lots of CSS classes in body tag automatically. These body classes are very useful for styling different sections/pages of site without needing to edit theme files unnecessarily.
For example WordPress add home CSS class on website front page and blog class on blog posts index page.
Similarly in your case, since you are using a custom page template for a page, WordPress added file name CSS class in body tag.
You can read more about body_classes in codex and a brief list of all CSS classes added by WordPress.
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