$sth->fetchrow_array() returns a row (assuming one exists), and has the side effect of moving "past" that row in the set of database results. With this line: print "NO ITEMS IN CART" unless $sth->fetchrow_array();

you try to retrieve a row. There might not be one, in which case you print "no items". But if there is, you don't assign the return value to a variable, so it just gets thrown away -- yet the results pointer still moves forward. That row won't show up in the list you generate in your while loop.

A possible fix could work something like this (untested):

my @fields = $sth->fetchrow_array();
if (!@fields) {
  print "NO ITEMS IN CART";
} else {
  while (@fields) {
    my ($id,$prod_id,$qty) = @fields;
    print "====== $id ======<br>";
    @fields = $sth->fetchrow_array();
  }
}
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        $perlmonks{seattlejohn} = 'John Clyman';