Hmm, yeah, I would apply some Seam Grip+WP or Aquaseal over these areas to prevent it from getting any worse. You could either cut away the part that has delaminated or glue it back down – it looks like there’s still plenty of fabric there so I wouldn’t be worried about the strength being compromised if you do cut it back (the seam strips are much wider than what’s required for a strong seam), but it might look better if you trim the edge straight and then glue it down.