error in board plugin - systems

Hello,

it seems that statistics shows in board about systems are not right :

see board-systems.png

it show 4 windows workstations but I've only 1 win workstation.

Maybe mix with Users ? :

see board-users.png

Cheers

(from redmine: issue id 1435, created on 2012-10-24, closed on 2012-10-24)