Oke so the issue:
I run 5 piece ebon set for raid buffs. The pieces i use are:
Necklace + Ring + Ring
1handed mace + shield
1handed mace + shield
Now what happens is when i'm on my first weapon bar everybody in the raid gets the buff. When i switch my second bar however the people in the raid keep the buff BUT the HP bonus from the buff disappears.
As shown in the image below from a friend of mine's character sheet, you can see that he has the buff ( you can see me right behind him with the ebon bubbles floating around). However the buff gives 0 health.

When i swap back to my main bar where the buff does work the following happens:
He keeps the 0 ebon armor buff. but also gets the buff that does actually work.

Please fix this as it's quite a big issue for weapon swapping on this set and is quite a silly bug for a raid set.