Shape to DTM Issue

There appears to be a bug with the Shape to DTM tool within the Superelevation Shape Manager Tools. What I think is happening is as soon as it sees an Independent shape, it doesnt know what to do. The picture below shows my shapes, which are correct, as well as the tin that was created using this tool. As you can see, the tin boundary encounters some sort of error once it hits the Independent Shapes. Does anyone know what I may be doing wrong? Thanks