There are some basic rules when programming ACD sets or you will corrupt your data as you may already have.
1. Never use CPY or MOV on ACD sets.
2. Before you use CHG, log out the set & disable the TN. Some people would recommend not using the CHG command. If you are using MAT, Switchview or OTM then I wouldn't use CHG either as none of these apps disable the TN.