Did you make offers to two different sellers? Only the seller you made the offer to will respond. If you made an offer and the seller counter offered, you can accept it and pay.
You should do yourself a favor and read the bidding, buying and best offer policies located in Customer Support. Ebay provide all the necessary information so that you are a well informed buyer.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.