Mysko händelse i gridview

Jag har en gridview som sorteras efter ett kolumnvärde som heter intOrder. I gridviewen har jag buttonfields som kan flytta vald post upp och ner. Kör jag sproc:en som hanterar detta så flyttas allt som det ska ett steg, men kör jag det från webben så verkar det köras två steg ochh vald rad flyttas ner två steg. Vad beror detta på?

Här kommer koden:
i aspx.vb-filen

Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
        If e.CommandName = "Up" Or e.CommandName = "Down" Or e.CommandName = "First" Or e.CommandName = "Last" Then
            Dim index As Integer = Convert.ToInt32(e.CommandArgument)
            Dim selectedRow As GridViewRow = GridView1.Rows(index)
            Dim idCell As TableCell = selectedRow.Cells(0)
            Dim intId As Integer = Convert.ToInt32(idCell.Text)
            Dim mBanner As New banner()
            mBanner.Move(intId, e.CommandName.ToString)
            GridView1.DataBind()
        End If
    End Sub

i banner.vb

Public Sub Move(ByVal id As Integer, ByVal direction As String)
        bannerDB.Move(id, direction)
    End Sub

i bannerDB.vb

Public Shared Sub Move(ByVal id As Integer, ByVal direction As String)
        Try
            Using conn As New SqlConnection(config.ConnectionString)
                Dim cmd As SqlCommand = New SqlCommand("tblBannerMove" & direction, conn)
                cmd.CommandType = CommandType.StoredProcedure
                cmd.Parameters.AddWithValue("@intBannerId", id)
                conn.Open()
                cmd.ExecuteNonQuery()
                conn.Close()
                cmd.Dispose()
            End Using
        Catch ex As Exception
            Throw
        End Try
    End Sub

och sproc för nedflyttning som exempel

BEGIN
	-- SET NOCOUNT ON added to prevent extra result sets from
	-- interfering with SELECT statements.
	SET NOCOUNT ON;

    -- Insert statements for procedure here
	DECLARE @localPosition int
	DECLARE @ProjectId int
	SET @ProjectId = (SELECT intProjectId FROM tblBanner WHERE intBannerId = @intBannerId)
	SET @localPosition = (SELECT intOrder FROM tblBanner WHERE intBannerId = @intBannerId)
	IF @localposition < ((SELECT COUNT(intBannerId) FROM tblBanner WHERE intProjectId = @ProjectId)-1)
		BEGIN
			UPDATE tblBanner SET intOrder = @localPosition
				WHERE intOrder = (@localPosition +1) AND intProjectId = @ProjectId

			UPDATE tblBanner SET intOrder = (@localPosition +1)
				WHERE intBannerId = @intBannerId
		END
END