Shirk bug : it gives aggro to sender instead of receiver

Date & Time: 21/07/2019 23h05
Frequency: rarely
World name: Omega
Character name: Kara Zhardrazh
Monster name: Titan in Eden 4
Class/Level: Warrior, 80
Party or solo: Party
In-game time: 21h05
Area and coordinates: Eden 4
Steps:
1. Die being main tank
2. Off tank takes aggro
3. ???
4. Tank swap, I provoke, the OT shirk
5. another tank swap on the next tank buster, the OT provoke, I shirk
6. when I shirked I got aggro by a 20% margin, even if the new MT was first in aggro before my shirk
7. fight continue, I shirk as soon as I can after the MT provoke, I still get aggro by a 20% margin

I always was under Defiance during all the fight, as well as the other tank was under Grit

This kept happening during all the fight after my first death. It also happened one time on Innocence Extreme one week ago, but I just thought I did something wrong.
I couldn't reproduce it on a striking dummy, and I didn't try to reproduce it in a real fight, it just happened at random

Connection Specs
- Type of internet connection: optical fiber

-=-=-=-=-=-=- FFXIV Information -=-=-=-=-=-=-

MyDocument C:\Users\nicolas\Documents
FINAL FANTASY XIV - A Realm Reborn C:\Program Files (x86)\SquareEnix
FINAL FANTASY XIV - A Realm Reborn Language 3 Region 3
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https://clips.twitch.tv/ObedientFragileWebPeteZarollTie

Here is a clip. Ive seen it happen many times already.