Changing the shoot angle on one robot changes all of the other robots' variables?

When I created my first robot I made duplicates to create the others.(There are 7 total) So when I attempt to change a variable like shoot angle( say to 3) it changes all of the other robots in the scene to 3. Does anybody know how to fix this? Do I need separate AI scripts for each of the robots? If I do need others scripts would you please give me a javascript that I need to add to the stock AI script that comes with UNITY.

Thanx Troy

u could just tag them Robot 1 Robot 2 Robot 3 or make new prefabs 1 for each and name them slightly diffrent