Event #26804. Because this adventure is a module, the GM should get 4 prestige like the players, but it recorded only 2 prestige on the web site. There was no field to change this amount when reporting the session.
I believe I've heard of this mentioned as a known bug on the web site a long time ago (perhaps a year or more ago), but this is my first time GMing a module instead of a scenario, so it's the first time I've personally noticed it.