Hi and welcome to Mystic Board.
What a fascinating first post too
Over the years this has happened to me a couple of times too, but, usually the people come back later and say "Oh you know that reading.... you were right!" Or they ring and say they couldn't admit the reading was right then, because their wife/husband/friend/uncle was with them and they hadn't told them or didn't want them to know etc. So first I wouldn't worry, 9 out of 10 is brilliant anyway!
Tiredness and stress can be an emotional mindfield that can and does affect readers and readings vastly. Perhaps next time charge more, do longer but fewer readings? Or perhaps take a break every few readings and go outside, reground and centre etc, then go back in refreshed? It is sometimes very hard to 'perform', sometimes the cards won't play ball, reasons can be that perhaps the querent is lying, perhaps they are stressed, drunk taken medicine or drugs? Or perhaps you are projecting yourself onto the cards and they are yours not the querents?
Reshuffling and getting the same cards! LOL!! I love this, it is so darn annoying when I read fo rme and this happens, the more I try and reshuffle, the faster they come out the same. Lol time to sit and look at that message.
Did your querent touch the cards? How did you cleanse them between readings? Do you shuffle them all or let others touch them?
In your incidence it sounds like the man was the problem not you, the cards wanted that message to be gioven and hoepfully with time your querent will realise and take the message?