Its been a while since I used one, but there should be two holes for the knobs to sit in. This should determine the correct positioning of the shroud?
But yes, I do recall a number of occasions when the shroud got in the way. and needed to be pulled tighter.
But I don't remember 4 plastic ribs, only 2, and they went around the shroud, not running the length. But that was a few years ago now. Maybe they changed the design.
Edit:
Like the image below.
Allows you to collapse the dob without removing the shroud.
Your one must be a new design.
Probably an improvement