Annihilating Light Staff Interaction with Purity of Elements Bug

I am on console version (PS5). The big is this: when I have the Annihilating Light Staff equipped, it halves the bonus I get from purity of elements. I am aware that the staff reduced your elemental resist. But it is also reducing the bonus from Purity of elements. I should be getting more than 30% resist from PoE, but instead I am getting something like 13.

I would say this is working as intended.

Annihilating Light's "(70-60)% reduced Elemental Resistances" read as "effects granting you Resistance are 70-60% less powerful".

The Modifier does not read as "-(70-60)% to Elemental Resistances" which would be a flat reduction and not impact Purity of Elements.

So a Purety of Elements with "+30% to all Elemental Resistances" would end up granting 9-12% to all Elemental Resistances.

What Gecko said. You basically take your total res (Kitava, res on gear, Purity, etc) and add it all together, and multiply it by Light's reduced multiplier.

The wiki has some explanations if you're interested, but a 60% reduced roll requires +248% total res to offset both Kitava and the 60% multiplier. And a 70% reduced requires +310%. So your 63 is needing somewhere around 270 total res from my rough math.

And that's just to res cap, more if you are investing into max res.