@themadmattt,
The solution to show the label 40 depends on multiple factors based on chart-options you are using. Setting axisX viewportMinimum to a 38/39 or setting labelAngle to a positive value should work. However, these are not the limited set of solutions as we don’t know the exact use-case of yours. Kindly try out the solutions & see if it works. If you are still facing issue, kindly create a JSFiddle reproducing the issue (with sample data) & share it with us so that we can look into the chart-options being used, understand the scenario better and help you out.
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Vishwas R
Team CanvasJS