MySQL executes several times the same request

Hi Everyone ! I've coded a php site for a musical store. At the end of every page, before closing the connection, I send an UPDATE request to increment a statistical tool. Recently I saw weird results, so I tried to understand. Looking in my logs, I saw that this request could be sent several times, arbitrary - can be 5 times or 8 or whatever... So my counter is incremented from 4 to 8 times. The server seems to resend the whole requestes several times. I have read all of my scripts, even coded some trace code, and sure there is no loop. The code seems like that: $counter++; $SQL = "UPDATE statistics SET VALUE (counter = $counter)" $res = mysql_query($SQL); mysql_closedb($DB); So, I do not see anything strange. Can u help me ? My own thought about it is something like a buffer not empty or something like that. Thanks !