After upgrading from 2.1 to 2.6 or higher, the Constituents\Personal tab no longer shows Job Title information previously entered using the Invididual Biographical Forms. The data is still present in the database and loaded by the Individual Biographical Forms but not displayed by the UI.
This was part of planned obsolescence for Job Title. In 2.5 and higher, this information is stored on the employer relationship.
See Employment History in the 2.5 New Features Guide