Reply to S4 mapping in Ableton issue

I'm attempting to map my S4 out into Ableton, which is going smoothly with the exception of the buttons (Cuepoints 1-4 and the sample deck launch buttons) taking two presses to activate their function. Not sure if this is an issue with the S4 in midi mode or Ableton, but for what its worth i have the tracking set to relative in Ableton.

Any insight on this issue would be greatly appreciated, thanks in advance.