Delivery goes to "Confirmed" but still pending ship confirm.

Hi

We are in 11.5.10.2  (internal Orders)

While perfoming ship confirm using QuickShip, we get a number of deliveries that show a status of confirmed, while the contents tab shows a line
status of Staged/Pick Confirm with a next step of Ship Confirm/Close Trip Stop.

This causes receiving issues at the destination org.

Does anyone know of a root cause/corrective action for this. We understand that we can reopen the delivery and then re-process,  but this causes process disruption.

Any help would be greatly appreciated

thanks

Ben