Cursor position in fields is inconsistent.

When reediting data on a record, pressing Tab key to go to next field, cursor ends up in middle of field.  Ends up in same postion as last field length/position, or at last character if shorter, of field just exited?.  Can vary from field to field based on lenth and position in previous field.  

Expect cursor to always be at beginning or end of data in field.  Or highlighted as selected text?  (Access has options for user to define desired action).  But never expect to find cursor in middle of field.