I don’t mind, but my monstrosity counter went from 1 to 3, even though I only remember us killing one monstrosity during that last mission.
We killed one beast of Nurgle on the smelter mission (malice difficulty, no modifiers or secondaries).
The only other thing I think may be relevant is that I Disconnected from a previous match and decided not to reconnect. We hadn’t seen a monstrosity yet, but I dunno maybe they did and it counted towards me?