Map Dependency Field

Hi, I tried to map dependency fields between 3 picklists. It works from the first picklist to second but not from second to third. The multi level selections were link in the following manner: Industry > Industry Sub > Industry Sub 1. Industry Sub 1 seems to display all values whatever selections I made to 'Industry' even though the dependency was connected only between Industry Sub and Industry Sub 1. Which means, the tier override the second mapping.