Weird "Cause of Death" information on revenant graves

Has anyone else noticed instances where the "cause of death" info listed on revenant graves doesn't make sense or refers to enemies/entities not in the game.

For example, I'll occasionally find revenant graves where the enemy listed won't align with any of the enemy types in nearby areas. During NG, I assumed it might just be a case of ng+ having different enemies or something and the ng+ revenant just appear in NG players' games, but having now completed ng+, they still don't make sense.

The other strange thing I noticed is that very rarely, it will list an enemy type that isn't even in the game (e.g. I found one that was "killed by Giant Centipede" - who/what the fuck is that?)

Anyone else find any other examples? Should we expect giant centipedes in the dlc/ng++ etc, or is it just a weird sort of easter egg or something?