I'd gotten a bug a few times where someone would cast something and they would see one thing and I'd see something else, and that would be the end of the game not long after.

 This time however we realized it was the one earth card that could fit in the earth slot 2, that was not held by one or the other of us.

 I hit hermit and he saw rejuvenation and we compared earth cards after that.  So maybe its a bug involving who has what cards and not a connection issue.