AutoCAD Civil 3D :: Slope Patterns - Grip And Drag Certain Points Along Feature Line

In order to create a swale, I created a feature line representing the bottom of the swale and graded up to an existing surface around its outer perimeter. The slope pattern looks ok when it initially generates the grading. I need to grip and drag certain points along the feature line in order to bring the top of slope lines of the swale close to the bottom of slope lines of an adjacent berm. As soon as I grip and drag the feature line, the slope pattern lines go awry. Instead of a short line then a long line, then short line, etc., the lines are all the same length. It actually appears as if short and long lines are overlapping each other.