[jackgavigan]

The chart isn't wrong. It's just measuring something different than the metric str4d is referring to.

Underneath that pie chart, there is a caption: "Transparent value (stored in t-addresses) vs shielded value (stored in z-addresses), in ZEC." In other words, that pie chart shows the number of ZEC that are currently residing in transparent vs shielded addresses at the specific point in time that you load that page.

The Advanced Network Stats page - https://explorer.zcha.in/statistics/network - has a box labelled "Shielded Transaction Percentage", which indicates what percentage of transactions involve a shielded value. You can see more details for different amounts of time on https://explorer.zcha.in/statistics/usage