Position synchronization - Position DFF is not fully reflecting at Assignment page

Summary: Assignment flexfield mapping is mapping DFF’s from Position to Assignment, but not all fields being populated with data within Assignment

1. Created 4 DFFs within PER_POSITIONS_DFF (positions attributes) and same 4 in PER_ASG_DF (assignment attributes)
2. Both have been deployed successfully
3. Used Manage Assignment Flexfield Mapping to map DFF from Position to Assignment so when POS SYNC happens will update Assignment
4. Added values to nominated Positions for all 4 fields
5. Updated Position Sync at Enterprise Level and selected 'Synchronize Mapped Flexfields' as an item to be synced (Allow Override Assignment already selected)
6. Have run Synchronize Person Records process (and Synchronize Person Assignments from Position)