Clicking on the graph to go to plot.ly and viewing its "data" tab, it looks like there's a blank X value for:
text y x 0 bucketed_success_rate: -0.02<br>pct: 0.1<br>`Interviewer Would Hire`: False 0.0987654320987654
Edit - it looks way better if I disable Open Sans. It might just be a font issue with Chrome or Windows.
Clicking on the graph to go to plot.ly and viewing its "data" tab, it looks like there's a blank X value for: