Just following up with this
We've since rearranged the beahviours. There is no "advanced" category any more.
The Joystick Left and Right behaviours are not combined into the "Joystick Input".
So drag on the joystick input behaviour, then tap the beahviour, and from the drop down select Joystick left, and then add another one and make it say joystick right.
Hope this helps!