See for example 
When I click from 'Overall Total' to 'Split by editor type' 3 things happens:
- the seemingly on/off buttons reveal themselves as radio buttons.
- a list of checkboxes is inserted
- the previous active radio button switches to green sub-second before it is grayed, the active one switches to blue (but on initial display (and after F5) the color is green)
Especially the last one is confusing.