If the correct expenses are not appearing for an approver, check the following.
Confirm both the claimant and approver are in the same dataset. Hover over the Expense tab in Workspace to verify they both have access to the correct database.
If the approver has permission to approve on behalf of another user, check that they have the correct user selected in the Approve screen.
Check whether the relevant expense type has a specific approver nominated in Settings > Expense Types that may be overriding the standard route.
If the expense was submitted before a change to the approval route, it will not be visible to the new approver. There are two options in this case:
Click Unsubmit on the claim, then resubmit it via the History area.
Grant the new approver permission to Approve on Behalf of a user in the approval route.
If the expense was submitted after the change but still does not appear, use the Export feature for Users and Approvals to cross-reference data.