Yes. The wonderful world of moisture. Water causes havoc to all RVs. You either get wood frame rotting, or delamination. Fiberglass delamination is actually harder to repair (but with the aluminum framing, usually the framework remains strong. The inside falls apart). The wood frames rot, but is actually easier to remove the aluminum skin, rebuild the woodwork, and reapply the skin.
Good luck on the repair. It can be repaired to look as it was never damaged.
I started with nothing, and still have most of it left
2001 Jayco KIWI 23B
2003 Jeep Grand Cherokee 4.7 AWD