that's about right. How many are this way? And is it the wine after you open them? The bottles themselves may smell musty if they've been in musty cardboard, but that doesn't mean the wine is corked.
Pour it in to a glass and let it sit in the glass for a few minutes. If the smell persists, that's not good.
One thing you might do is go to a good wine store in your area and take the wine and ask them.