Member A and member B, both are JapanAuctionCenter.com member.
Member A bids 40000 yen and member B 50000 yen on the same auction.
Member A is automatically eliminated by our internal system and member B won the auction.
Since we use the same ID to enter your bids, the cancelled bid of member A (40000 yen), won't affect the closing price.
But if someone else (out of JapanAuctionCenter.com) bids 45000 yen on the same auction, member B's bid amount will be automatically updated for 45500yen (proxy bidding)