I believe this is the case of the cushion, it happened once or twice with Hickory Chair's seat cushion on khun Dear and Khun Wi (Customer) and what HIC offered was to send us the new seat cushion and they will also absorb the cost of the fabric (this is COM BB for Kravet).
Will try to find the emails with images of the same case and send it you for your reference ka.
FYI, we suspect that it was because of the cushion gold moldy ka, as far as I can remember.