I was really looking forward to these, but have to say that I'm disappointed in EPCC. Registration is off and noticeable on the backs and fronts (look at the 5 of hearts). And the font on the 3s looks bold whereas other numbers look standard (not sure the proper terminology for it). These issues exist in all three decks.
The threes - and the twos, if you look - do sometimes appear marginally darker than the other numbers do. It was never really anything I took note of. Remember as well, there have been past Expert/Legends decks that used a special light/bold combination on all the card faces, where one index was light and the other was dark - it allowed one to orient the entire deck as a one-way design from the faces, giving a magician an alternate method for finding someone's chosen card.
The registration of that particular 5 of hearts is just a little bit off center, but only by a very small amount, certainly not enough to affect game play. In your photos, I'm looking harder at the backs - there don't appear to be any off-center backs, right? That would present a problem in terms of a deck's usefulness.
I looked my deck over. My 2s and 3s are slightly darker than the other numbers, but not to the point of being a distraction - honestly, had you not pointed it out, I would probably not have paid any attention to it. My 5 of hearts is centered perfectly and I've spotted no issues with a single card back being off-center.
If you feel that the product is defective, I'm positive that if you contacted CARC with the issue, they'd be happy to try to resolve the problem for you. Bill Kalush is generally a good guy when it comes to paying attention to customer service. Write to them at orders@conjuringarts.org and I'm sure they'll be glad to help you.