i've already double checked that, and is happening to who has the rights to edit articles (even i, the administrator, cannot unlock articles of other)
from what i see, the article become unlocked after some amount of time (this is a normal behaviour of campsite, if i'm right) after how many minutes an articles unlock itself?
an improvment could be to allow the admin to setup the locking time of an article... on my situation, even 20 minutes of locking is fine... or even better, detect when an user does "save & close" ad unlock the article on exit