Hi @Qwertyqwerty08 you have ended the auction too early in this case. This no doubt, will come from your confusion of bids being placed within the last 15 minutes of the auctions duration. You stated in your post, this to be 5 minutes, but it is always 15 minutes.
I will take the stat point to be the first offer you recieved. This was at 03:08 pm GMT+0 (all times will be in GMT+0). This means that any bid received at 03:53 or after would extend the auction by 15 minutes. The bid at 04:05 pm did just that, extending the auction to 04:20. This allowed for the 04:14 pm bid (the last bid) to be place, again extending the time by 15minutes, giving an end time of 04:29 pm. You carried out the trade before this time
Please read our Auction Rules and General Trade Rules.