I had three of the same items approximately 1 minute apart, they were all in one group with the same ceiling snipe price. I left it and in the morning it hadn't bid on any of the items. The items were won at prices lower than the snipe I had set so it seems like it didn't work. Although I might add that all three items were won by the same person and the prices didn't really go up in the last 12 hours of the auction, so maybe it has to do with ebay, that buyer/that seller. All the items were sold by the same person and bought by the same person, so maybe they communicated and made a different deal.
Thanks for the provided information.
There was a change on eBay around that time, so I had to make an update to reflect that.
Unfortunately, it affected some snipes including yours. It's back to normal since than.
I'm sorry it affected your snipes. I hope you can find a similar or better deal on the same item.