Forum:Possible Counterfeit Cards?

I have a few cards with references such as YSD63-EN006 or YSD64-EN006. They have card numbers on them and when I check these they show the same picture but a slightly different card name. For example "Beiige, Vanguard of Dark World" is shown on my card as "Strong Soldier Beiji of the Dark Circle. The card descriptions also display some rather poor translations in to English. In all other respects they look like normal cards. Can anyone tell me whether these are genuine cards or counterfeits.