Integration Services :: SSIS VB Script Loading Data Into Oracle DB Missing Some Data

I'm using Script Component to load data into Oracle DB due to the poor performance issue. Now, I found it will missing some data during the transmission. Please see the screenshot below: 

SQL Server：
Oracle:
DDL:

create table Person
(
BusinessEntityID Integer,
FirstName nvarchar2(50),
MiddleName nvarchar2(50),
LastName nvarchar2(50)
);

Result:

I follow up this article: [URL] ....

VB Script: 
Imports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper
Imports Microsoft.SqlServer.Dts.Runtime.Wrapper

[Code] ..........