Ravenous Hunter 0.0% Healing Bug
https://cdn.discordapp.com/attachments/296257799879524353/405811875675242498/unknown.png
So it turns out, if you disconnect with Ravenous Hunter, your stacks get reset to 0/0, and you get 0.0% healing. You don't even get the Flat 2.5% for having the rune...