The leaves are too young and not yet properly developed. Give your little tree sometime to settle in and fill out. And then maybe we can narrow it down.

FWIW, differences between the red leafed dissectums are very subtle. Specific ID's on many JM's are difficult to say with any degree of accuracy. Would it be a deal breaker if all we could say with certainty is that it was a redleafed, weeping dissectum? (This is why I urge folks to purchase JM's from reputable suppliers with known stock, rather than from box stores or ebay. You never know for sure what you're going to get).

Was it the Red Select they had for $14.98? I bought one too. I also have a crimson queen in the same area. These are the leaves on the crimson queen.

Yes! It was the one they had for $14.98.

And here is a screen shot from the growers website.

If not knowing is going to drive you crazy, I'd say return it. The truth is, buying from a big-box store, you're never really going to know. It might be Red Select, or it might be a similar tree, possibly not even a named cultivar, that someone is clipping and grafting. Or it might be a different cultivar. Really hard to tell when there's no accountability by the time it gets to the shelves.

To complicate matters, if you read that UBC thread I linked earlier, Red Select may or may not be the same as Inaba Shidare. According to Vertrees' book on Japanese maples, Inaba Shidare/Red Select is darker and more upright than most dissected reds, cascading still but cascading less than others, the leaf lobes are not so finely dissected as many other red dissectums.

If you google around and look at close-ups of leaves, yours looks more like a Red Select than a Crimson Queen. It's still a little early to tell, and I have to emphasize-- with its origin, you're never going to know for sure. The fact that the nursery is giving seriously incorrect info on its tags is a big red flag that proper ID is not a priority for them.

Well, whatever it is, it's staying and it's pretty.

They are nice for sure. I have close to 25 Japanese Maples in my yard. But I figured for $15, I'd give it a shot. I have purchased one other Japanese Maple from Walmart 2 years ago, and have been happy with it. I believe it's going to make a pretty bush regardless if it is Red Select, Inaba Shidare, or Crimson Queen.

Good attitude. :)

...If it helps, I have two 'Corallinum' cultivars at my house, both purchased from very reputable growers, and they are clearly not the same plant. Are they both pretty? Yup. Are they staying? Yes. Would I give scions to someone wanting 'Corallinum'? Nope.

Oh, and this is the same Crimson Queen that I posted earlier, but with the sun shining through it's leaves. I figure the Walmart plant will have the same effect when the sun hits it:

My Japanese Maple leaves are turning brown. I just planted a week ago. Is it dying?

Can't possibly tell from that sparsity of information :-) Start your own thread (much more successful than piggybacking onto another), include photos that clearly show the problem and tell us how you planted it and how often it's been watered. We'll try our best to figure out what's happening.