My SELECT SUM query in PHP is not including the last insert's value

Question

I have a database such as:
Name, Product, Score, Feedback

Each row (with Dave being the first insert and Sam as the last) for example is:
Dave, Apple, 3, Good
Jim, Pear, 5, Awesome
Sam, Peach, 2, Okay

When I run my code, it would only add Dave's and Jim's to total 8. It's not adding Sam's score value until another new insert has executed.

<?php  
    //connect to the database
    $connectionstring = mysql_connect('localhost', 'teammystic', 'teammystic1' ) or die('Could not connect: ' . mysql_error());  
    //select the database  
    mysql_select_db('my_teammystic') or die('Could not select database: ' . mysql_error());  
    $Query = "SELECT SUM(SCORE) AS VAL FROM customerFeedback";  
    //execute query  
    $queryexe = mysql_query($Query) or die('Could not query database: ' . mysql_error());  
    $dataArray = mysql_fetch_assoc($queryexe);  
    // Free resultset
    mysql_free_result($queryexe) or die('Could not free result: ' . mysql_error());
    //disconnect from database
    mysql_close($connectionstring) or die('Could not close database: ' . mysql_error());
?>

I am trying to a make an average score display, any help is very appreciated thank you.