What do the different Token versions mean?

As the site has evolved and new functionality has been added over time and because of the nature of smart contracts with every new iteration of the site we have also had to create new versions of tokens.

To see which version a token is you are looking at you can go to the tokens page and in the bottom right there will be a selection of tabs. If you select the 'Info' tab it will display in the data which version the token, is you are looking at.