Omen of Homogenising Exaltation

I got a shield with 3 modifiers:

- T1 : 104% increased armour (defenses)
- T2 : +216 to armour (defenses)
- T1 : +282 Stun Threshold (Stun ??)

I tried to use Omen of Homogenising Exaltation + Omen of Greater Exaltation + Greater Exalted Orb on my shield aiming to get these modifiers:

- % of Armour also applies to elemental damage (defenses + elemental)
- % increased armour + to stun threshold (defenses + Stun ??)

But it not worked, i got a message about not having matching modifiers on the shield. I mean i could not even use those omens and exalted.

Is it a bug?

not bug. https://poe2db.tw/us/Shields_str#ModifiersCalc

only 1 other defenses tag. stun thresh has no tag.

Even so, should'nt get two defenses there?