It could be an old can... I know that when I bought some a few months ago, it had garlic listed on the label but when I emailed them, they said that they hadn't removed the ingredient from the label until a certain date. So either the label is wrong... or the can does have garilc in it.
Can you return it or exchange it for another case that might not have garlic on the label? Either that or email them again and ask them when they changed the labels... I remember them saying something about cans after a specific date not having garlic, even though it's labeled as such... if you ask them I'm sure they could tell you for sure.