Check and see if you have any vertical circular curves. Geopak supports only parabolic. You can create reports in OpenRoads.
communities.bentley.com/.../20480.vertical-alignment-is-not-exported-to-native
communities.bentley.com/.../16018.analysis-reporting-openroads
communities.bentley.com/.../20480.vertical-alignment-is-not-exported-to-native
communities.bentley.com/.../16018.analysis-reporting-openroads