Three players go in, a second later they all have the buff. They lose it 30 seconds after they return (except for hunter for some reason). The question is does it make sense to have healers spam heal to build up the effectiveness of the buff as it supposedly it stacks. If it doesn't stack, obviously they should just get out as soon as possible.
Could this be a WoL issue, or is there something else in the logs I should be looking for?