What stops <a href="#">Top of page</a> from staying on the page? [closed]

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Using XAMPP 8.1.6 HTTP/1.1" 200 and PHP 5.2.0, I have several .php pages at https://localhost/project_01/LOTW/ Each .php uses the same footer.

<?php include_once 'footer.php'; ?>  

The footer.php contains <a href="#">Top of page</a> This is seen in the source code of the generated HTML file.

This works for 9.php pages.

Only .php one fails by redirecting to https://localhost/project_01/LOTW/%E2%80%A6# ( seen as https://localhost/project_01/LOTW/...# )

So, the question is: What breaks <a href="#">Top of page</a> on a .php ?