That's strange. Perhaps it's something new on the 22's. The 3 honks is how fobiksafe responds when a fob is left in the truck and you attempt to lock it, but I wonder if they added this in addition to the interior chiming, or if there is a bug with something.
One way to see if it is fobiksafe causing it, would be disabling it using alfaOBD if you have access to it or know someone that does.
Are you locking the doors when you exit momentarily? If not, try locking them and see if it responds any differently.
It's helpful in getting the best responses if people know how your truck is equipped. If you get a moment, create a signature with your truck's details like you see others have done so we know what kind of options your truck may/may not have which could help tailor responses better.