Pages/StudentManagement/StudentImport.aspx : When we export student , Show id no already exist , but that id number is given to other student , & Two student are different

Instance : http://pc11-pc:2500/Pages/BaseFramework/Security/Login.aspx?OrgGroupId=1101
Username : Admin
password : Admin

Organization : 1st

For more please discuss

database credential : 
Server name : PC11-PC\SQLEXPRESS
Username : sa
password : sa123456

Database name : NVgrowmore