In that case it's possible (rare, but sometimes happens) that the final version didn't use the Volcano feature and removed it prior to release.
EDIT - yes, there ya go. They took it out as my demo now shows the same pay tables as yours does.
Ok interesting. Thanks for clarifying for me though. So the selling point of the newer version was those extra lines to me at least. And it seems they decided to scrap the Volcano spins and those extra lines for that feature. So it will now become a slot I will not play, it appealed to me because of those extra lines. But seeming they removed that, it has become far less appealing Which is a shame