ORD - Adding a driveway civil cell

I am adding a driveway civil to my proposed corridor. Only my back edge of driveway is located OUTSIDE the proposed corridor boundary. This is yielding strange results with the proposed corridor. Anything OUTSIDE of the Proposed Corridor when clipped goes to elevation ZERO. How can I fix this problem? Do I need to get the Back edge of the driveway into the Proposed Corridor? Yes, there is a profile on the back edge of the driveway set to the existing ground elevations.

Thanks,