Bidding wrongly awarded

I placed a bid on Bid or Buy for product and requested the system to act on my behalf (place bid on my behalf with set increments). As soon as another bid was placed, the system made the bid placed by the other party invalid and incremented my bid automatically.<br> <br> In any auction house a bid placed by may not be made invalid. The system can not over write it, but it has. So the bid was awarded to me even though it never was suppose to and should have been awarded to the other party. That didn't happen due to system over write!!!