Looking at item 5902446021 shows no record of a bid so it wasn't placed by AS.
Reasons could be:
1. ID and/or password wrong in AS
2. Lead time too short
3. AS/eBay system problems
4. You were banned by seller
You should have an email from AS titled Auction Sniper Snipe Status Report - click on the link that says Click here to see eBay's response to your snipe. What reason does that give?
R2