Check your .htaccess code is correct?
To fix it, use the following .htaccess instead:
RewriteEngine on
# Turn off HTTPS
RewriteCond %{HTTPS} on
RewriteRule ^ http://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
# Send everything else to the CI front controller
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php/$0 [PT,L]
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