Edited by Teevesnacks on June 29, 2014 6:41AM
Looks like weapon enchants are affecting the heal amountUpdate 2:
After respeccing it seems strife is not affected by the reduction, I also did not spec into Soul Siphoner as I believe this may be causing the healing reductionUpdate 3:
Strife is affected by the heal reduction if you have an enchanted weapon and melee attack first then use strife
VR1 High Elf Nightblade
I've come across a reproducible bug with the healing from swallow soul
Basically if you cast elemental blockade(any aoe seems to trigger this though) and then cast swallow soul the healing is reduced significantly, almost as if the percentage heal is being calculated off the previous ability used.
I have noticed quite a few times where I am using only single target abilities and the healing amount is reduced mid-fight but I am unable to ascertain which skills are causing this as it can happen randomly.
I find this to be a very irritating issue as my survivability is cut short dramatically Edit:
This issue was happening pre 1.2.3 but I have only got around to posting it now apologies for my laziness