Convertible top on 2002 Porsche Boxster

When top is put down and then back up, there are two dents in the plastic window. One of each side about 2 inches from the edge of the window on both sides.
This is new, didn't happen before.
Any idea what the problem is?

2 answers
go to a highly trained convertible top shop that knows Boxters. this is a touchy issue and can go awry, if ones does not know exactly what to do.
Defect.This is the place all Boxster tops seem to crack.It is a design flaw and happens after several years.