Despite multiple paid invoices, the paid total for all of my clients is $0 and the balance is the total of all of their invoices, paid or not. This occurs both on the /clients/view and /clients/status/active pages. It appears to be because there are no payments logged into the system associated with the invoices, but the invoices do show as paid.
It would be nice to either properly flag the invoices as unpaid if no payments are associated with it or to show a $0 balance for all paid invoices. Given how the accounting system works, the first is likely the better solution despite being more complex to implement.