did the previous answer from Shivani not solve this?
Maybe you can check the values in the catalog_product_entity_varchar table. They should have the store_id 0 to be considered default
with the following query you can find the entries with the non default values for your attribute (given your attribute id is 1244, which i have from you other question):
select entity_id,store_id from catalog_product_entity_varchar where attribute_id = 1244 and store_id != 0
if you find some (or many) we would have to check in the next step, if they have default values or not
I wrote a query that will assign the value for the attribute 1244 to the default store if there isn't one defined already.
Although I'm pretty sure that this works, you really should make a db backup before executing update queries on your database
UPDATE IGNORE catalog_product_entity_varchar SET store_id =0 WHERE attribute_id =1244
the update statement did actually not work but updated it and its easier now