Sacred Flame Shrine Sceptre reduce player's resistances

Here was a theme with a bug of Sacred Flame sceptre:
https://www.pathofexile.com/forum/view-thread/3634162

As I now see, the scepter works in such a way that it reduces the resistance of enemies, as noted (with Doryani's Prototype body and -140% lightning res it goes to approx x3 fire damage for enemies in my presence).

But the problem is that the enemies also have a scepter effect that increases their damage. I tested this on a low level map - I'm level 78 with full fire resistance cap, facing level 66 white fire casters. If I take off the scepter, the fireballs from the enemies will deal 50-100 damage to me, and if I put on the scepter, the fireballs will deal 1000-1500 damage to my face.

Not sure this should work this way.