Yes, I saw that pic, but I actually meant the other side of the zipper. I must say, I once saw a wallet from Dolce & Gabbana that also had a very stong scent. I can totally understand that some people would describe this scent as unpleasant.
My wallets don't have an unsmooth zipper but that doesn't say it isn't possible that they aren't out there.
I hope someone can give you a second opinion on this. Sorry that I can't be much help here.
However, if you feel really uncomfortable with your purchase, is it possible to return it?
Or do you live close to a Dolce & Gabbana store? If yes, maybe you could bring it in to see what they say?