When an Approver or Auditor saves changes (such as changes to the funding) to an Travel Authorization, Cash Advance, or Expense Report, that item will temporarily disappear from the worklist in their approval queue.
This occurs because e-Reimbursement needs to temporarily pull it from the Approver or Auditor's workflow to save the changes. The TA/CA/ER doesn't immediately return to the approval queue because that page only updates when manually refreshed.
To resolve this, simply click the "Refresh List" button found within the approval queue and the TA/CA/ER will return. It will also reappear if you exit and reenter the approval queue.