Hi There,
On your WP installation there is a folder named blog that folder contain a folder named backup but no index file that is why you’re seeing what you have on your screenshot.
The backup contains a WP installation files, which Im not sure if its active or just a pure backup. You need to delete that blog folder, but you need to confirm if that sub-folder backup is an active site.
Please contact your hosting support, they can help you better on this.
Thanks.