Are you talking about the "online reading" in the second link? I'm pretty sure that that is just intended as a promotional online game for the show, and that the interpretations are supposed to be spooky on purpose to fit in with theme. You'll notice that the interpretation of the third card tends to change from something pleasant to something bleak with an effect of the screen, and at the end the "do you want to share it on social networking?" message is something about demons finding you because your thoughts weren't pure. You weren't doing anything wrong, it's just the show's site fitting the tone of the show.
I posted that link only because it allows you to preview some of the cards, but the link posted in the previous page by jolie_amethyst is much better than mine because it includes all the cards.
I think the person you were quoting was talking about reading with the actual cards, not the gimmicky online reading. The deck was made for this show and is featured in it, which is why the show's merchandise includes a deck just like the one the characters use, and the show's site uses the same designs in that promotional feature on its site.
I hope this helps.