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@cgar,
In JavaScript, Objects are passed as References. So, changes made to a title.text will be reflected across all charts as same object is passed as chart-options for all. Using separate options for every chart would work fine in your case.
Please take a look at the following StackOverflow links- Javascript by reference vs. by value Is JavaScript a pass-by-reference or pass-by-value?
Also, please take a look at this updated jsfiddle.
___________ Indranil Deo, Team CanvasJS