Code inserting some records twice

Hello, thank you for taking time to read this post...I hope someone can help.

I am working on an online survey, the problem is that my SQL query is inserting some entries twice.
This survey is for members only so therefore require you to login ( so I can capture their membership number)

The problem is the Membership Number is being inserted into the database(one record - membership number, no survey answers) as soon as the survey page is opened.

When all of the survey questions are answered the Membership number and the responses are entered as a new record (one record - Membership number and survey answers)

I am trying to use an if statement but the code is not to be working.

Here is my code:
<%
dim sSQL,sConnString,mSQL, SubmitFlag
pos=Request.form("pos")
contract=Request.form("contract")
.......

If SubmitFlag =1
Then
sSQL="INSERT INTO wage (CompanyId,pos,contract,service,basic, bonus, total,car, pension, category) " & _
"VALUES ('" & MemNo & "','" & pos & "', '" & contract & "', '" & service & "', '" & basic & "', " & _
"'" & bonus & "','" & total & "','" & car & "','" & pension & "', 'Workshop')"
objConn.execute(sSQL)
'close the object and free up resources
objConn.Close
Set objConn = Nothing
End if
%>

//HTML Code

<form name="form1" method="post" action="">
<input type="hidden" name="SumbitFlag" value="1">

Thank you for your help, hope I have explained it clearly enough!!

Im sorry I put this post in the wrong place should be in SQL Development.

i think this should be in the programming section: i see no problem with your SQL statement, this is a programming problem, probaly the code running twice because of some circumstance