Entity Framework worked weird when get parent information - linq-to-sql

Question

Currently, I create a table like this:
CREATE TABLE [dbo].[AM_Module](
[ModuleID] [int] IDENTITY(1,1) NOT NULL,
[ModuleName] [nvarchar](100) NULL,
[ParentID] [int] NULL,
CONSTRAINT [PK_AM_ModuleID] PRIMARY KEY CLUSTERED
(
[ModuleID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[AM_Module] WITH CHECK ADD CONSTRAINT [FK_AM_Module_AM_Module_ParentID] FOREIGN KEY([ParentID])
REFERENCES [dbo].[AM_Module] ([ModuleID])
GO
ALTER TABLE [dbo].[AM_Module] CHECK CONSTRAINT [FK_AM_Module_AM_Module_ParentID]
GO
With ParentID contains ModuleID's parent.
And I have 2 row like this:
ModuleID ModuleName ParentID
1 ParentName NULL
2 ChildName 1
Now, in my EF, I run the LinQ to SQL:
var q2 = from a in unitOfWork.RepositoryAsync<AM_Module>().Queryable() where a.ParentID == 1 select a;
var w2 = q2.ToList();
When I check by the SQL Profiler, I see the query will be parsed like this:
SELECT
[Extent1].[ModuleID] AS [ModuleID],
[Extent1].[ModuleName] AS [ModuleName],
[Extent1].[ParentID] AS [ParentID],
FROM [dbo].[AM_Module] AS [Extent1]
WHERE 1 = [Extent1].[ParentID]
The SQL returns 1 row.
But when I check w2[0].AM_Module1 (relationship with itself), I have value of parent with ModuleName too.
Why it happens? The SQL was returned only one row. How the EF know parent's data?
Please advise.