Opened Legendary Dragon Decks; wrong card order?
Are these cards fake?


tl;dr: No, they seem original. Cards may have slightly different details (like coloring) between different printings. Also, cards appear ordered by card number and not by card type.



I doubt it. Besides, I also doubt that Amazon would sell fake products advertised as legit.

You mention that the order were some monsters first, then spell/traps, and then other monsters. However, cards appear ordered based on their card number, not by card type.

The Legendary Dragon Decks cards have a specific card number, for example Dark Magician, the Dragon Knight is number "LEDD-ENA00". This card, as it is number 00, should come first in the order. Then number "LEDD-ENA01" comes, etc...

If we check the first link I included we can see that this is true. Some monsters come first, then a bunch of spell/traps, and finally other monsters, all based on the card number and ordered in ascending manner.



Edit given card images:

Judging by the images you included, I'd say that those cards seem to be legit. Be careful, as they are from two different sets, so the newest version (the one on the left, from the LEDD collection) may have slightly different coloring (as it's newer), but that doesn't make either fake:


We can see that the card number corresponds to the official one: LEDD-ENC23. The one on the right also displays it's corresponding number from the Yuya Starter Deck: YS16-EN040
We can see the dimensions fit, and all parts of a YGO card are there (type, the frames, copyrights, etc.).
The First Edition golden Millenium Eye sticker on the corner seems like the original ones (holographic). Do check both of them more closely but from here it seems ok).
The card code matches for both of them: 77826734