This has happened to me, and I asked the reader, who I have read with many times, why did the reading change: did I do something to change it, did the other person do something to change it, did something happen in the cosmos to change it. What is up with the change.
I even mention I know that if another person is involved, things change, but I'd like to know what it was that caused the change.
That flipfloppin g crap makes me insane, but sometimes it could all boil down to the fact the reader was just plain wrong.