tier price display

when i set up a tier price in magento, the drupal field is filled like:

Tier price:
a:1:{i:0;a:6:{s:10:"website_id";s:1:"0";s:10:"all_groups";s:1:"0";s:10:"cust_group";s:1:"3";s:9:"price_qty";s:8:"100.0000";s:5:"price";s:7:"80.0000";s:13:"website_price";s:7:"80.0000";}}

nothing seems to be processed