If employees are disorganized it can cause problems for you and other employees. 

As a leader, you need to deal with it. Other people are watching and wondering why you are letting this problem continue. 

Sit down with the disorganized and explain what you see and why what they are doing is disruptive. And figure out why it is happening. 

Maybe they need more from you. Maybe you haven't said anything about it so they assume what they are doing is ok. 

Good leaders are constantly repeating what they want to happen. You have to set expectations and constantly remind people. 

By the way, if you have good employees leave them alone. Don't adopt a blanket policy that impacts everyone. Deal with the disorganized employees and let the organized employees keep getting work done.