Why a page posting the request more than one time?

Hi,
I'm sending some data from a normal html document's input fields to a server side code(serlvet). Normal POST method only.
In this case, some times the servlet is invoked only once. and some times it is invoked twice. Why it is behaving like this?
I'm very much sure that I'm clicking the submit button only once in all cases, but still it posts the data twice some times.
Thanks in advance
Kannan.T

Summary columns is related to the Data wizard not to the report wizard,
So, if we use Ref Cursor query to create the Data Model we should create summary columns mannualy.

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