The message "You are being redirected" means that your page or website has bot protection enabled. On login/admin pages, such as
wp-login.php, this message will always be displayed, unless the IP address of the visitor is whitelisted.
However, if you are seeing this message when sharing a post at Facebook or Google, means that you leaved the "Emergency DDoS Protection" enabled in the Security Options.
If you keep it activated all time, it'll do more harm than good. It's only necessary during some rare types of DDoS attack, that Sucuri Firewall team will instruct you to activate if you don't have a good cache configuration.
The solution is to disable the "Emergency DDoS Protection" in the Security tab of the Firewall dashboard and wait a couple minutes.