This is one of the weirdest bug I've found in DDO.
Although it's probably just a case of a manual variable entry error.
The Legendary Shattered Onyx, Legendary Crown of Fireflies and Legendary Green Dragonscale Bracers all have the "Insightful Resistance +8" ability, but in reality they give only +5 to fortitude and will. They DO give +8 to reflex.
With nothing equiped, I have saves of 25 / 21 / 24.
With a heroic Shattered Onyx (+2), this increases to 27(+2) / 23(+2) / 26(+2).
!! With the above mentioned items (+8), this increases to 30(+5) / 29(+8) / 29(+5) instead of the expected +8's to everything.
With a parrying10 item (+10), it indeed increases to 35(+10) / 31(+10) / 34(+10).
As you can see from the insightful+2 and insightful+10 item tests, it is not simply a case of a +3 fort and will in the Insightful bracket already. It's truly a wrong entry for the
Tested on both a pure 30 sorcerer and a pure 30 paladin, with and without regular Resistance bonuses.