Builds that have been started over the the xmpp plugin are currently not assigned to the user.
The console output shows something like that:
>> Started by [hidden email] on request of '[hidden email]'
It should be possible to assign the build to the corresponding user by searching for the user with that profile information.
Is this really related to the ci-game plugin? The plugin should only give points to the users that have commited something to a build, ie they are referred in a SCM change set.