If you're using the Box Plot viz at https://splunkbase.splunk.com/app/3157 then it's an archived app that probably is outdated and may have compatibility issues. Consider trying the box plot viz available in https://splunkbase.splunk.com/app/5730. That said, does the time field have values greater than 20? If so, the lack of a default condition will cause the case function will set total_time to null, which might generate the "trace 0" graph points. | eval total_time=case(time<= 8, "8", time<= 9, "8~9", time<= 10, "9~10", time<= 11, "10~11", time<= 15, "11~15", time<= 20, "15~20", 1==1, ">20")
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