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You seemed to be passing string to x-value within Returning Visitors data because of which it’s not rendering chart properly. As of now, CanvasJS supports number and date-time in x-value. You can use label to pass string that has to be displayed over axis. Please take a look at this updated JSFiddle.
It would help us understand your scenario better if you could share us working JSFiddle that reproduces the issue. The JSFiddle that you have shared doesn’t seems to be working.