Data Combo won't Update

I have this database program which keeps tracks of employees information. I have two datacombos that tell the department and status of the employee, the name, starting date and all other info is in textboxes. I use an Access database which has the employee table and other tables. When I edit an employee, textboxes update but when I update the datacombo, they don't update. If anybody has an idea why they won't update, I would greatly appreciate it.
the datasource for the datacombo is one table and the rowsource is another table.