ASIN: B0D8H8DNVD -WHY AM I BEING CHARGED STORAGE WHEN I HAVE NO INVENTORY LEFT--PLEASE ADVISE AMAZON

HELLO,

On this product, why am I being charged inventory surcharge/storage when I have no inventory left. Says I have 1 in inventory that 181-330 days old, but then says 0 left and I can't sell it. Please advise asap