Erm....Jason, earlier when I told you I wasn't good at maths?..well I wasn't wrong lol I believe I have solved it lol I was adding all the products as well as product options...what I completely forgot that some product options come included. (basically a customer can add additional charms etc.. to an existing necklace for example). So some products come with options included and some products have options that are completely optional. So the website IS calculating everything as it should...but my stupid brain needs a reboot lol
Thanks for all your help :)
Chris