Horizontal Alignments cannot be adjusted

I have drawn horizontal elements to form a horizontal alignment in open roads. Normally, when you select such an alignment, orange text and orange cursors appear around the element so that you can manipulate it and the alignment. However, I get no such text or cursors when I select the element. Not only that, there is no way to manipulate the element at all. You can delete it and redraw it, but that's it.

Does anyone know what's going on?

Thank you.