How it shows up in Chrome, IE, Safari, and Opera 12 (More or less, there is slight variation in browsers):
How it shows up in Firefox:
In Chrome, I’ve also noticed that the tooltip (Auto-generated with shared as true) will re-order the text inside for each entry with slight movements of the mouse horizontally. For example, this is is what it looks like at first:
and this is what it looks like with the mouse moved slightly to the right:
Though I did see the above mentioned behaviour in chart, am not sure if the issue is with the library or the data provided. If you can create a jsfiddle with the data, that would help me in figuring out the issue.