I withdraw my earnings every month so the amount I see at the top is how much I’ve made so far this month.
For some reason this amount isn’t matching up with the figure in my Earnings page for “April 2013”. It seems like my Earnings page is missing 1 sale.
You’re probably best reporting this to Envato Support if it’s something that requires an action.
Open up a support ticket: http://support.envato.com/index.php?/Tickets/Submit