Not to defend this store but working in one myself sometimes items are priced higher or lower than what we have marked physically on the package. With how fluid commerce is these days goods can fluctuate pretty fast, to keep tagging physical inventory would be a nightmare in most cases so that's why it's sometimes different from what it says. To me that's not false advertising.
False advertising is an ad or other communications means saying one thing to bring you in and then having a different price in person or once you are trying to place an order. That's a deceitful practice that I would never condone.