Title… I´ve to kill 750 enemies in melee on my alt-char. So i´ve played a mission yesterday and only 18 counted. I´ve played 2 mission today with the new single-target forceswords and nothing counted. So i´ve been like "ok, maybe it´s bugged on the weapon.
So i´ve started to use my duelsword again, checked Melk out after the run, nothing happened. I relogged to be sure and suddenly it increased from 18 to 90.
But this 72 kills might have been a thing from the run with the duelsword, so yes… it might be a thing that the new forcesword bugged it out. Had no issue on my main Psyker with any weekly and those “kill enemy on range” worked on my alt aswell.