Bug with RF, Elemental Weakness maps and Rise of the Phoenix Shield

So I've mainly been playing a Righteous Fire build on Talisman, and one of the things I've noticed now that I'm doing a bunch of maps is that on maps with the Elemental Weakness mod (which brings my fire resist below my current max cap of 88% to 68%) my current health total is not being properly displayed. Basically, the bug starts when I hit the low-life threshold of 35% and the passive from my Rise of the Phoenix Shield kicks in and gives me 25% extra fire resist (bringing me back to my 88% cap). If I'm understanding the interaction correctly, I should be sitting at 35% max life on these maps when I have RF on because when I'm over 35% max hp, I would start losing health, and under 35%, I start regenerating it. And as far as the game is concerned, that is what's happening, yet my health bar and resistances do not show that; they show me at 100% health with the bonus from the Rise of the Phoenix Shield still applied. How I know that's not what my health is actually sitting at is because when I take any damage (including using my Cyclone skill with Blood Magic), my health will immediately drop from 100% to 35% and it'll incorrectly start regenerating me to 100% hp again.