Hello!
With one of my auctions there is a yellow smiley indicating that I won, but I didn't!

Hello Luka,
Thank you for your question about the status of your snipe. We investigated to see what we encountered when we placed your snipe. There are a lot of factors and situations that affect the outcome of the snipe. We have since updated the software to detect that particular scenario. You should not see this happen again.
Thank you for the report. We welcome any follow-up comments or further suggestions you may have.