NPC stats all seem tied together now

If I drop multiple creatures onto a map, they all functionally have the same HP. If I subtract HP from one, it drops it from them all. This didn't used to behave this way. It only happens if I have "Represents Character" selected. I'm using Storm King's Thunder specifically and most recently I had Kuo-toa in an encounter, 6 of them dragged from the default monster manual of the adventure and this happened.  It didn't do this last week, anyone have any ideas? I can make them all unique by assigning them to "None/Generic Token" but that doesn't let me easily give them vision en mass for targeting purposes etc. 

I should add that tokens I drag from the Token Page do not seem to do this, it's only tokens that I have created (though pre-gen tokens look the same, settings-wise as mine do). 

You can keep each token representing the kuo-toa character sheet, but unlink bar 1 from HP and set its attribute to "None." This will allow you to change the Bar 1 value of each token independently. (If you take a look at the journal tab of the module, you will see that the pregenerated monsters are already set up this way.)

Ah ha! Thank you so much! 

In case you want or need more info, here is the wiki article on  Linking Tokens to Journals Here is a  video  which demonstrates the procedure.