Low Poison healing my character HP instead of reducing it.

Description of the bug: (optional screenshot/video):
Please click this for the link as the video file is too large to upload.

In this video, it shows that I was being healed by the poison which is caused by the dark cornians. It also shows that when i use dragon roar, I am being healed despite of the skill.
(My pet is on with auto hp pouch but it is set to 20% with Ginseng Roots and it typically auto pot me to about 14-15k of my HP.) This is a bug with concerns to the poison healing my instead of reducing my hp.

https://youtu.be/n5erdfmJKSc

What is supposed to happen?: The dark cornian's poison is supposed to be reducing my HP but instead, it is healing my HP.
Where did you find and/or notice this bug?: This have been ongoing for a couple of weeks.
A step-by-step guide to re-producing this bug (optional):
Extra information (optional): As My job is a Dark Knight, this affects my skill "berzerk" and it renders me being unable to use berzerk to full efficiency. This also happens at CWKPQ bosses which causes poison. Whenever i got poisoned from any random mobs, i get healed instead of being reduced in my HP.

I sincerely hope that the team can help me with this issue.

 

Okay! I was just wondering if my character was bugged. Thanks Kimmy!