First Release of an Order not being marked ship complete when subsequent releases are

Hello, we are running into an issue where when we have an order that is broken into multiple releases, for example order 199999 is broken down into 199999-1-1, -1-2, and -1-3 and they ship on the same day the -1-1 release will not be marked ship complete while the others are. This could happen if the releases are on the same invoice, different invoices etc.

Can anyone think of a reason why this might be happening. I have gone thru and confirmed that the amounts that are shipping match the amount ordered both for the individual releases and the order total and also if its a problem with the account doing the shipping (its usually the same account for all of the releases so not much help there)

Thanks