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 flipflopping crap makes me insane, but sometimes it could all boil down to the fact the reader was just plain wrong.