I have a test build deployed to a public server at work
To replicate the symptoms

• Open the page here
• Click JSON ChartJS
• This is Level 0. Total Event Types for Organisation. Click a segment of the doughnut chart
• This is level 1. Drivers vs Count of Event Type. Click a segment of the bar chart
• This is level 2. Driver and all Incidents of Event Type. The chart gives an idea of when the events occured/are clustered. The table lists out more details, with a link to Level 3 (not implemented yet)