Auction Sniper will always bid. You mention that there is no reason to bid because no one has yet bid against you -- but thats where snipers come in. They intentionally wait until the last second.
Please see this post for more information on this:
https://community.auctionsniper.com/4/OpenTopic?a=tpc&s=9654015631&f=7754015631&m=9144090851
Adam R.
Auction Sniper Support