output only monitoring in mono

Hi there I am trying to record the kemper in my DAW but having some issue's.
I am using a macbook pro in to an rme babyface then in to kemper etc..
When I monitor a mix its in stereo in both headphones.
When I use my axe fx its in stereo through cans, but with kemper its v loud in one ear and almost silent in the other.
I have changed output from main to direct and set output options to mono or stereo but with no difference.
I am a little confused.