Mine did this while it was still under warranty.  The vague answer I have is a velcro wrap had to be stitched back in - it pulls away over time - or something.  
Edit:  Mike addresses this in his write up: 
"1.  Torn or separated convertible top holding strap"
the top is now doing the overlapping thing again.  I haven't yet taken a look to trouble shoot.   
If I don't make sure it is tracking correctly before completely closing the top, I am concerned that I am stressing and causing harm to the top and its parts.  If you haven't gotten this corrected yet, I do encourage you to do what you can to control it.
I am very appreciative / grateful for Mike Focke's web site and this forum.  I've never had a car require so much attention and maintenance before.     
