Chart bug with labels

I have some metrics being calculated in a sheet, which I'm trying to pull into a column chart in a dashboard. Everything seems to work great until I deselect the option to use the column name as a label. I don't want the column name to appear in the chart, as it doesn't add any value, and is just confusing. But when I deselect the option to remove it, it also removes one of my data points from the chart. I'm pretty sure this is not by design and is a bug. Screenshots below of both before and after I deselect the option, as well as what the underlying data looks like.