The seller canceled the order.

[pptaku]

Hi everyone. After the auction ended, I immediately paid for the item. A few hours later, the Seller canceled my order. Probably not satisfied with the price achieved for his item. Is it OK?
I think this is mainstream ebay, you bid - you win - you pay.

[redwick1]

You can not force then to sell and neither can ebay force them to honour the sale.

It is very bad ebaying 

What reason did they give for cancelling.

If they cancelled for the wrong reasons then they will pay the fees and

a defect on thier account

If it was the wrong reasons then you can report to ebay

You have feedback to leave but be careful not to mention ebay or dispute

[pptaku]

The seller did not provide a reason for the cancellation. No feedback option.