Allied mercenaries occasionally behaving as enemies

Exhibit 1: Video of someone getting killed by their own merc, with the person swearing to this happening often https://www.pathofexile.com/trade/search/Crucible/vgO8evWFE

Exhibit 2: https://www.reddit.com/r/pathofexile/comments/1lith5b/comment/mzemunl/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button -> Me, explaining how I sometimes get my curses on myself, as well as CB (I use Corrupting Fever).

Exhibit 3: https://www.reddit.com/r/pathofexile/comments/1lith5b/comment/mzeny5n/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button -> Someone else with a similar experience to exhibit 2.

Can't speak for others, but I can tell this toes not happen to me when I'm not using a merc.

It really looks to me like sometimes mercs become targetable by the player somehow, but they have reflect.