Could be wrong but it looks as if the membrane actually shrunk causing it to pull away??
Mike & Gayle
Our 3 fur children "Ting-Tang"&"Saylor"(Shih Tsu's) &"Kai" (Finnish Spitz)
2007 Silverado Classic 3500 LT C.C. Longbed Dually,
Duramax, Allison Tranny, 62 Gal. Titan Tank
2016 39MB 5.5 Onan, Residential Package, Goodyear G114's, Mor/ryde heavy duty Shackle/bushing upgrade.