hi, welcome to the forum.
common problem and not a major issue. its caused when the roof hasnt been down for a while and the fabric 'forgets' how it folds.
The Fix:
1. open the roof about half way
2. get out of the car, go to the roof and smooth out the fabric so it folds nice and neat
3. lower the roof all of the way
4. if it is still a little high give it a push in the middle where the clip is, it wont do any harm.
it happens to me after i have washed it or not had it down for a week. you may have to repeat the process a couple of times until it fixes itself.
hope this helps