when a customer pays by paypal and it auto updates the status of the order it appears that it si not actually applying the payment to the invoice total for this order (see below to understand what i meen as its awkward to explain)

basically as you can see in the picture below on the part marked as (A) we have recieved a paypal ipn payment but if you look at the part marked (B) that payment has not been applied to the account or the invoice total so this meens that according to (C) there is still £18.45 oustanding

is there any way to get this to auto update without me having to make a manual adjustment and apply the money manually??