States are going through their own battles - for example, Massachusetts has H960 in the works. Bills are being debated in many other states regarding the shipment of alcohol. If you order on line from someone who claims to ship to you, when the above chart shows it should not be allowed, they may be bending the rules to do so. One way some work around the restriction is to ship to a related wine store in the given state. That wine store then reships the package, within state lines, to your doorstep or makes you come pick it up there.
Some wineries simply break the laws out of ignorance.
There are a few organizations working to sort out this muddle and define a clear set of common guideslines. Free the Grapes is the most active group. Their web page has a lot of information about the current state of events. The Wine Institute is another storehouse of knowledge, tracking the wine shipment situation. In Texas and Indiana, Individuals are suing to be allowed to have wine direct shipped to them.