Your Mobile Security for iOS did not display a blocking page when a secured (https) website has been blocked. Instead of displaying a blocking page, it stays on the same website or sometimes saying page is unreachable.
A Blocking page is a page displayed by Mobile Security app to inform you that the website you are trying to access is unsafe.
Instead of a blocking page, Mobile Security for iOS uses push notifications to inform that the website you are trying to access is unsafe.
Tapping the push notification will show you the list of websites blocked by Mobile Security.