I have seen this before - it is not uncommon in auction software: if you do not click the 'proxy bid' box, it takes your new bid as a bid against yourself. Not sure about Bob's software, but I haven't seen that it has any advantage over what Leland's uses - for the most part I prefer Lelands. Regarding the accidentally unchecked 'proxy bids' box - I've done this a couple of times and each time simply called the auction house and they corrected the issue. I don't think it was Lelands in either case.
The only clearly inferior auction software is Hunts, but even that can be easily dealt with.
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