Form submits more than once during redirect

[eluser]natsabari[/eluser]
After a long googling i couldn't get the solution for my problem ,so i decided to ask u people,

My requirement is save a text from text area to table and send user to the same page where he submited the form.

Every thing works fine until i redirect user to the page where he submited the form.
Now two records added to the DB,first with correct data and the second with "0".

Is it normal.
any one want my code for analysis ,let me know.