Unless I'm mistaken, right hand brifter should go to the back brake, no? Maybe the OP's goes to the front?

Edit: As usual, "it depends":

Right Front or Left Front? The usual system is to have the rear brake controlled by the lever on the side of the bicycle that corresponds to the side of the road that it will be driven on, i.e., right in most of the world; left in the British Isles, Japan, and other places where they drive on the left. (The European Union, however, has standardized on having the right-hand lever control the front brake).

https://www.sheldonbrown.com/cables.html