swerve - 6:56 pm on Jul 16, 2003 (gmt 0)
What you are likely seeing is different results being served from different servers or data centers. Due to load-balancing, every time you hit search, the search results could be served from a different data center with a different index. Seeing "different indices" like this has been quite common recently. For example, sometimes some indices have new Fresh data, while others don't -- perhaps this is what you are seeing.