Cookie troubles

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Hi, I have a site where I set a cookie with a life of one year. Lately
however ive been having a lot of trouble with users who cant login to my
site aldough ive checked and everything should work fine.

There is a vilid cookie, but it's an old one .. a new one should have
been set but for some reason the old one still appears. I dont believe
it has anything to do with my script cause it's as standard as they come

code for the cookie (php)
SetCookie ("bezoeker", $cookieval, time()+31536000,"/");

example value of the cookie

Is there anyone who has any ideas why a new cookie wont overwrite an old
one. Is there anything I can do .. maybe cache control or something ?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
" ">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">

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