corridor limits change depending on the chosen interval.

Hello, 

I was creating some corridors that ended up looking like this. 

I initially thought that it did not extend to the limits of the horizontal alignment because of a shorter profile. However, the profile spans the limits of the horizontal line. 

The same template also produced this result when placed along a different horizontal/vertical alignment. 

As I was troubleshooting, I realized that the limits of the corridor would change depending on the interval chosen. For example, a template interval of 20 would reduce the limits of the corridor while a 5 foot interval would increase it but never really allow the corridor to extend throughout. When I changed the limits of the template drop from 0+00.00 to 0+00.01, both corridors seemed to work fine. See below. 

What could be causing this issue? 

Thanks!