We installed bistro blinds (Bunnings brand) about 18 months ago. We installed a 2.7m blind joined to a 1.8m blind with a joiner strip. We attached the ends to metal posts with the wall anchor strips. It worked well and looked good. Sometime later, the larger blind was rolled up for a while and after putting it down recently seems to have shrunk, both vertically and horizontally. It will no longer reach the joiner strip to be able to zip it up and in trying to so some of the stitching came away. Is there any way to get the blind to return to it's original dimensions? Thanks