Not obvious at first, but the WP Version css removal function is calling non-existent address causing a 404 record. It creates an incorrect link e.g.
usr/home/../.. bit causing the problem. Maybe because you're using
libs\function.php line 201-202 instead of
plugin_dir_url('remove_wp_version.css', __FILE__) and
plugin_dir_url('remove_wp_version.js', __FILE__) respectively, removing the initial slashes from the following quoted urls? However,
remove_wp_version.css doesn't appear to exist in the css folder anyway.