I just started playing again, and updated oUF plus my layout to deal with the newer tags system. For some reason now the health bar doesn't update. I checked it with oUF_Classic and get the same thing. I'm using version 1.3.27 of oUF. Any clues?
Edit: Ok, tried Pitbull and I get the same thing.
Edit 2: Ok, turns out I fixed it, but my test was a failure. I was using bloodrage, but turns out I have the glyph that reduces its health cost by 100%.