Staging not showing latest tasks

Hi,

I'm currently seeing this issue where new content added to our site doesn't show up in the Staging's list of tasks for Syncing to Production. When viewing the page, the message shown is

There are no tasks to process within current location.

Pressing on Synchronize current page or Synchronize current subtree will run through the Tasks synchronizations, but never pushes anything over to Production.

Thanks for any and all input on this.

Ahmed