Apply Standard Deviation to Timeline Data

Thanks for your patience while I was working through some confusion over doing this for the first time in Power BI. I made great headway and set up the above sample report. I'm confident the calculations are working correctly, but my last step is to visualize the standard deviation measure in the stacked bar/line graph at the bottom. For some reason, the line only registers zero when an EquipmentType is selected, whereas the line should match the stdev calculations shown elsewhere on the screen.

Thanks very much, again.