I know a while back, when shintao 3 was first released they were having threat problems. I have no idea if this was ever reported before this but i Bug reported this and thought i would present it to other monks out there so you guys know as well.
If you look at the buffs i am hoving over the second buff for Shintao, which is obtained by having the Shintao 3 enhancement. which is increaseing threat by %15 (there words not mine) I am guessing this was an underlying buff that wasn't meant to be implemented for this set, but was. With the resent U9 patch this tooltip was prolly updated to show this even though it wasn't ment to be in place to begin with.