Thank you all. It is faint but it's pretty noticeable in certain angles under specific lighting...which is why I didn't notice it at the store itself.

I'll try to get a better picture but I have to wait for a sunny day. I didn't realize this can happen with leathers so that's good to know. However it is bugging me (especially because it's right on the front flap) so I feel like I should just exchange it now because the bag looks so well made it'll last me a long time. I don't want to have regrets later on. None of the bags on Instagram have this issue either.
I'm going to call them (they are a little slow responding by email) to see if it's possible for a store credit to cover some of the cost of shipping because i'll gladly take that! I've also filed a claim with my CC insurance to see if they'll cover it as well. I'll keep everyone posted.