How to allow for movement on the x/y axis while being dragged by spline

I am trying to make a flying type portion within my level where the character is dragged on a path using a spline (The spline movement works currently) but i wish to have the ability to move left/right/up/down on the screen as if in a 2D setting. The up/down movement works as the spline does not interfere with the Z axis but the left/right movement does not as the x/y axis is being continuously updated to move the player along the spline.


I tried using an offset that my inputs could update by that has not worked


This is the input system currently

Im aware the screen shot the target reference is not connected but fixing that did not fix the issue