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Profile Graph x axis error in Pro

Question asked by Lynn_Carlson on Feb 14, 2018
Latest reply on Feb 14, 2018 by Dan_Patterson

I have a simple line feature class with z values.  There are 20 lines that are each 56 meters in length.   The z values were generated using the Interpolate Shape tool within 3d analyst toolbox. 

Using ArcGIS Pro 2.1.1, I am creating  Profile Graphs of each of the 20 lines.  In these graphs, the x axis for every line extends to over 80 meters.  At first I thought the horizontal distance might be inclusive of the terrain, but regardless of the terrain (z value) complexity, the horizontal distance does not vary. 

If I create a profile graph in ArcGIS Desktop 10.6 with the exact same data set, the x axis distance for all profile graphs is consistently set to what I would expect - 56 meters - which ignores variability of the terrain, but at least doesn't consistently add 20+ meters.

Can anyone help?  What am I missing?