SRD Tokens All Taking the Same Damage At Same Time

HI, whenever I drag and drop more than one token of the same exact creature, damage applied to one of those creatures, all of the others gets the same damage simultaneously.  Ext. I have five Nothics on the map.  Nothic 1 takes 10 damage and I subtract it. However, it then subtracts 10 damage from the other Nothics who were NOT hit. The only work around I've found is to put two copies down, unlink the second copy from Represents Character and then make mutiple copies from that unlinked copy.

This is because you linked the token's HP to the character sheet. You should check your campaign settings if you set it so that you link your tokens to the character sheet.

The tokens are already linked; I just simply dragged and dropped them from the SRD

The SRD does not have tokens set up, are you using the Monster Manual or Volos?

If I go to the SRD and type in, let's say dragon, it gives a list of dragons. I drag and drop it onto my map and the creature token appears.