When i change the columns name the value is not displaying.

I have a mdx query and when i change the columns name the rows are shown but the columns are still the old ones .
I change the query to have the null values converted to 0
The first query is this and the data is showing normally but without the null values :

Select 
    NON EMPTY {[Measures].[col_], [Measures].[col2_], [Measures].[col3_]} 
    DIMENSION PROPERTIES PARENT_UNIQUE_NAME, HIERARCHY_UNIQUE_NAME, MEMBER_TYPE ON COLUMNS , 
    NON EMPTY Hierarchize({DrilldownLevel({[Region].[Region].[All]})}) 
    DIMENSION PROPERTIES PARENT_UNIQUE_NAME, HIERARCHY_UNIQUE_NAME, MEMBER_TYPE ON ROWS FROM (
    SELECT ({[Category].[Category].&[Oil]}, {[Year].[Year].&[2019]}) 
ON COLUMNS FROM [SIIBPAGESATDIREKTEF]) CELL PROPERTIES VALUE

and the second query that shows the null values is working in sql server but not in flex monster is like this :

WITH 
    MEMBER [Measures].[col_] AS COALESCEEMPTY([Measures].[col],0)
    MEMBER [Measures].[col2_] AS COALESCEEMPTY([Measures].[col2],0) 
    MEMBER [Measures].[col3_] AS COALESCEEMPTY([Measures].[col3],0) 
Select 
    NON EMPTY {[Measures].[col_], [Measures].[col2_], [Measures].[col3_]} 
    DIMENSION PROPERTIES PARENT_UNIQUE_NAME, HIERARCHY_UNIQUE_NAME, MEMBER_TYPE ON COLUMNS , 
    NON EMPTY Hierarchize({DrilldownLevel({[Region].[Region].[All]})}) 
    DIMENSION PROPERTIES PARENT_UNIQUE_NAME, HIERARCHY_UNIQUE_NAME, MEMBER_TYPE ON ROWS FROM (
    SELECT ({[Category].[Category].&[Oil]}, {[Year].[Year].&[2019]}) 
ON COLUMNS FROM [SIIBPAGESATDIREKTEF]) CELL PROPERTIES VALUE

maybe the flexmonster is not recognizing the changed columns name and is showing the old ones without data.