Endure Fire
 

Cast this spell on myself, got the bonus, spell wore off, my fire resist is now 15 and is in red. I'm pretty sure the 15 is legit (I'm a wood elf), but the red text is odd. Probably just a cosmetic issue.

Edit: turns out it actually was down, from the natural 25. I don't know how this could have happened, but I think that Thistlecoat fading made it go back to 25 from 15.

Never mind; turns out I was confused because Treeform decreases fire resist by 10. Everything is working properly, I think.