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[PHP] Multiplied visits

I remember it's not the first time it happens to me, and I want to ask
if others have found this phenomenon:

Under concrete circumstances (I don't know which are these, but
everytime is the same movement), a PHP page only visited one time it's
executed from 2 to 4 times. There is no frames, and no other HTML
references to same script.
In my case it's a simple form to which the "submit" button is pressed;
the PHP file is executed 2 times with Midori web browser (Webkit) or 4
times with Firefox browser (Gecko).
Only first execution receives form data (POST); next executions don't
receive them, and it happens that at the forth execution (Firefox)
HTTP_REFERER is not reveived, asif it was the first visit.

This is the form:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
<html lang="ca">
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <meta name="robots" content="none">
  <meta name="description" content="Message about problems">
  <meta http-equiv="Content-Style-Type" content="text/css">
  <base target="_self">
<body>          <form name="for_newsession" action="." method="post">
           <input type="hidden" name="ges" value="newsession">
           <input type="hidden" name="sid"
           <input type="hidden" name="pcl" value="">
           <input type="hidden" name="created_user" value="">
           <p>Nom d'usuari: <input type="text" name="login" value=""
size="16" maxlength="32"></p>
           <p>Contrasenya: <input type="password" name="password"
value="" size="16" maxlength="32"></p>
           <p><input type="text" name="created_balance" value=""
size="8" maxlength="16"></p>
           <p><input type="submit" name="submit" value="Comença"></p>

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