Best offer cancelled before expiry date

My best offer for £20 was cancelled by ebay when a lower bid came in at £15, this was before the best offer expiry time.  Is this common place or just a feature of the ebay software

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If somebody has placed a bid then that is the reason why the Best Offer option has vanished from the auction.  If you still want your £20.00 offer to count then I would suggest that you submit a bid and see whether or not £20.00 would be enough to put you in the position of being the highest bidder for the item.