This is officially stated on the Paypal Site ::
The chargeback system is independent from eBay feedback. Filing a chargeback does not limit a buyer's ability to leave feedback for a seller. In fact, a buyer can file a chargeback even if they have already left positive feedback for the seller. Receiving a chargeback does not in itself negatively impact a seller's eBay feedback rating.
So dont worry if anyone has filled a fake chageback....
