Checkbox in MVC

Hi,

I am using MVC 4 and there is a form where details of employees is being taken and i have put  checkboxes for list of departments is employee attached to, but sometimes the checkboxes misbehaves and the default value selected is not shown on page

 

Please suggest me better way of using using @Html.Checkbox or @Html.CheckFor with a form

having model and and list of checkboxes displayed