In the slave status page, there is a list of jobs called "Projects tied to <slave name>". That list should only show jobs that are explicitely tied to this slave.
For me it als shows lots of modules of maven style jobs that have nothing to do with that particular slave whatsoever. Only the module part of the job is shown here, not the top level maven job it belongs to.
So far I have found no pattern which jobs are shown where. I suspected it to be the last used slave, but it is not.