By default, this chart shows only crafted and quest-reward gear. You should add more Sources using the menu at the top of the page.
You can also focus on just one or a few slots at a time by using the Slots menu right next to it. The Help menu will explain a few more things, like how to read this chart.
Thanks, and good luck!
— Rick O (Apanthrope, Bleeding Hollow-US-PvP)