Buy it now button not working

Hello there my buy it now button vanishes from my order's, which predictably leads to floods of buyers messaging me about it. Can anyone tell me why this is happening. Dave
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If you list as an auction with added BIN, the BIN is disabled as soon as you get a bid.  Otherwise you could have a winning bidder and somone buying it at the same time.  Adding a BIN is only an invitation to buyers to skip the bidding process.

 

It costs 50p to have both. So either use BIN on it's own ( with best offer option if you wish) or simply start your auction at the lowest price you would be willing to accept.