It may just be me, but I noticed it always showes up when I re-run missions, both Fed and Kling. May be just the random NPC thing, but if I do episodes ‘fresh’ it doesn’t appear (or I just haven’t noticed).
Kinda fun if it is intentional during re-runs; time-cops sending Wells “back in time” as you’re messing with your own time-line, as it were (mission re-runs to get that extra bonus item). Seems to be a little tougher too.

"Boldly bashing Borg to bits since 2012..."