@epinephrine,
You can format the x and y-values being shown in toolTip by setting the xValueFormatString and yValueFormatString respectively, as per your requirement.
If you are still facing the issue, kindly create a JSFiddle reproducing the issue you are facing and share it with us so that we can look into the code, understand the scenario better and help you out.
—
Shashi Ranjan
Team CanvasJS
