Second Wind help me understand

[C U R S E]

Hi everyone so I have have a Regen Sentinel which is my first and I am lost in understanding Second Wind. I understand it has two purposes, in which to restore HP's as a heal and a self REZ. I have slotted it and it only says 1.69 HP's enhanced with a 92 % healing percentage slotted. I have tried it out a few times and after a mob dropping my HP to about 36 % and tried it there was crap for healing and some increase in my Regen. I know it caps your HP at 2088 like a Hoarfrost or Dull Pain, but there was no healing. Is this bugged at the moment or am I missing something?