This isn't one of the defaults user groups, I made a custom user group
I didn't have any idea that there are some access settings in that tab too, the cause of the problem was exactly on the forums tab, the "Can lock topics/questions?" and "Can Unlock topics/questions?" had been enabled,
I think the logic of this kind of setting, isn't correct, when we disabled the lock and unlock the topic ability, why in the forums tab, we should have same settings?