Hello Dylan,
Thank you for your question about this snipe. I could only find one incident like this, and you should be fine with 3 seconds lead. eBay simply took longer to execute the bid relative to other snipes.
On other occasions, you did not meet the minimum bid increment. For a bid to register on eBay, when there are already at least one (1) or more existing bids, the "bid increment" must be added to the current price to win.
I hope this has been explained to your satisfaction. If not, I'm happy to answer any other questions you have.
bidslammer