I've observed this twice now, not sure what other factors contribute ... I've witnessed it happened to another player when killed by another (not me) and their corpse continued to slide an additional 15 feet, then glitch back to where they originally died and slide the 15 feet again. This continued to repeat the entire time I was there.

The second occurrence I killed a player and their body slid out the 2nd floor balcony of a building and to the ground below, and continued to repeat that cycle until I left.

Both players were killed by melee.