pressing one button cancels every other button press

[Daldameht]

I mapped out some buttons on my controller for move left and right and jump. As I am moving, when I press a button to jump, it stops all left and right movement. Left and right is mapped to my control stick and jump is the Y button. Normally, I can play the game with moving and jumping, but the mapping is canceling that How do I fix this? Thanks lads.