Depends on what you mean by "odd". Mine smells like neoprene. Which you could say is an odd smell, but not really odd for a mat made of neoprene...
Odd is vague, but I was trying to avoid being unkind. It smelled a bit like cat pee.
It seems to have gotten a lot better over time, though. I was able to air it out over the weekend and now you can barely smell it. It was all shipped in the same box, but nothing else smells that way, so that's good. It didn't really hit me until I unwrapped the mat from its plastic.