It's all on the title tho i will write what i experienced.

I had gone to Obsidian Citadel in Dragon Isles, there are djaradins which casts Deathless Rage on themselves which is purgeable buff. Normally, addon was showing it above of the target with my settings being "Show Auras enabled on bottom, Show Purge enabled and Purge on Opposite enabled" , it doesn't show it anymore.