The data in unlimited entity reference select field does not appear after pressing add another button

I have 2 content types (Performance Plan and Task). Task content type has a field called (assign to User) that is filled by an employee username. Employee Plan has unlimited select field that display all the tasks that assign to the employee. This field is an entity reference field in view. Below is the view.

find the screen shoot of

Views (viewSSH.png)
Contextual Filter (contextual_filter.png)

Each employee has a node in Performance Plan and he is the author. My system works fine, but when I add another item in the select list, all the data in select list disappears. Could anyone tell me what is the issue? Notice that the node can be accessed by the employee and the line manager of the employee, so I have to depend on the author of the node to display the tasks.

Before
Select List (select_list.png)

After
After add another task (AfterAdd_anotherTask.png)