Enfeeble Percentage Bug

Enfeeble tooltip says there is a percentage to apply for normal/magic/rare monsters, and another smaller percentage for uniques.
I can see below enemies lifebar that currently the smaller percentage is being applied to uniques and rares. Rares should be getting the bigger percentage.
Either the skill is bugged, or the tooltip is wrong.
Also, it has the same problem when using as an aura with blasphemy.