regression: activity stream displaying odd history

I noticed this on my demo setup that I first started a week ago, and has been stopped/started a few times since then, but I never started with a clean database

to reproduce, I ran the GoGreen locally, logged in/out a few times, stopped tomcat, switched the time a week into the future, and restarted tomcat

see screenshot, I would have expected something like "last week, admin logged out"