So this has been happening to me constantly; it actually started around Patch 7.1.5.
Whenever I die in combat and release instantly (or within maybe 0.5 sec of death), every mob I still had aggro on will immediately break off from the remaining party members and run back to me at the nearest graveyard.
Obviously, this is usually horrible and results in even further death. Yesterday in timewalking Slave Pens, this actually resulted in a hilarious situation where the mobs alternated between evade-bugging for about 30 seconds and one-shotting party members after I released (there is a drop down section in the middle of Slave Pens so the mobs didn't have a path to me).
I've been waiting for nearly a year for this to be fixed, and I'm sick of waiting so I'm trying to figure out why this actually happens. I'm posting here in the Paladin section with the '[Prot]' tag because I believe that the common factor in these incidents is that I am tanking (as a Prot Paladin). Whenever other party members tank, this basically never happens (or extremely rarely). It could be Consecration, Blessed Hammer, or even one of my talents or legendaries at fault. Whatever it is, I'm really sick of it and looking for other people who also have this happen.