Doubled entry in event log

[VariableCrawl]

I'm noticing something very odd with my local compilation. Whenever I formally identify an artifact, that event shows up twice in the list of events in the dumplog.

34398 | Snake:5 | Entered Level 5 of the Snake Pit
34716 | Snake:5 | Reached skill level 9 in Charms
34810 | Snake:5 | Identified the cursed -1,+3 hand axe of Magnificence {chop, rPois rC+}
34810 | Snake:5 | Identified the cursed -1,+3 hand axe of Magnificence {chop, rPois rC+}
35646 | Snake:5 | Reached XP level 18. HP: 110/112 MP: 27/29
35672 | Snake:5 | Got a serpentine rune of Zot

Like so. No one else seems to have the problem, and it exists in every revision of trunk that I've tried. Any idea what could be causing this?

edit: Correction, I've found this server dumplog which has the same issue in a few places (turn 92426, for example): http://crawl.lantea.net/crawl/morgue/co ... 211655.txt

[duvessa]

This is also occurring with my rc. See http://crawl.akrasiac.org/rawdata/mutar ... 042801.txt. Note that it only occurs with weapons.