how to accept priceline counter offer?

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Hi,

I have used priceline to bit for three flight ticket from san franciso to chicago on 08/13 to 08/18. I named my price $300,

$330, $343. Each time priceline reject my offer. However, it counter offered me the price $392. After I choose the $392 price, then it told me that it could not find a ticket match the price. For all the price I offered, I got the same situation. Every time, I choose its offer and it claims it could not find the ticket.

Did I do something wrong? Or this is normal. I thought that when I accept priceline offer, I should get the ticket.

Thanks

Frank