I clicked Approve to approve a timesheet, but it is marked Acceptable instead.
Only the last approver in the approval chain actually changes the status to Approved. All previous approvers simply mark the timesheet as accepted by them, which indicates to the next approver that the timesheet is recommended for approval.
Why can't I perform some actions in Microsoft Office Project Web Access?
Depending on the permissions settings you used to log on to Project Web Access, you may not be able to see or use certain features. Also, what you see on some pages may differ from what is documented if your server administrator customized Project Web Access and did not customize the Help to match.