Hello,
Looking at the screeshot we can guess that the the LowerWhiskerValue and the UpperWhiskerValue are swapped.
In general for a properly looking Box-and-Whiskers data point the order of the values should be like:
LowerWhiskerValue < LowerBoxValue < UpperBoxValue < UpperWhiskerValue
Can you please re-check whether the values that you pass to the chart comply with the rule above.
Best Regards,
Nevron Support Team