Forum Moderators: Robert Charlton & goodroi
Just a guess that this may have to do with what the prior search was and how you'd entered it... ie, whether you've, say, just changed one word in the search box, or typed it in from an unrelated search. I made some comment about observing this recently in the minus 950 thread.
In today's case, though, I wasn't searching methodically, so I'm not sure about the order of searches and can't reproduce it.