Thank you for reaching out about your contacts! I apologize for any confusion there may be about the amount of contacts in your account. I took a peek and can see you are correct, you do have less contacts then the total you mentioned. When it comes to seeing how many you have, you always only want to look at your Active list. The contacts listed under Active are the accurate amount.
These contacts are who you can email, and are the only contacts you get charged for. It looks like you may have found this total number of 7,422 from your All Contacts list.
The All Contacts list will give you an incorrect amount includes everyone in it; whether they are active, unsubscribed, or even missing an email. I hope this explanation helped!