3D Analyst Interpolate Line on TIN Producing Stair Step Graph

[bthomp75]

I'm using Interpolate Line to cut cross sections from a TIN created from LiDAR. However, the y-axis data is only picking up every vertical foot, creating a stair step profile graph (see screenshot). It's either not displaying the points or is not rounding to any decimal places. Does anyone know if there is a setting where I can adjust this to pick up all of my elevation points between each vertical foot?