Column sizes in views

Hopefully someone can help.
When I look at a concatenated view, the column sizes of the view are much larger than when I run a describe of the view. Does anyone know why ?
in sqlplus or sql editior in sql developer
desc t1
SOURCE_ID NOT NULL VARCHAR2(16 CHAR)
PRODUCT_ID NOT NULL VARCHAR2(6 CHAR)
DESCRIPTION VARCHAR2(30 CHAR)
AS_AT_DATE DATE
desc t2
Name Null Type
SOURCE_ID VARCHAR2(16 CHAR)
LB_LOGO VARCHAR2(6 CHAR)
LB_DESCRIPTION VARCHAR2(30 CHAR)
AS_AT_DATE DATE
The view looks like:
CREATE OR REPLACE FORCE VIEW v1 (source_id, product_id, description, as_at_date )
AS
SELECT source_id, product_id, description, as_at_date
FROM t1
UNION
SELECT source_id, lb_logo, lb_description, as_at_date
FROM t2;
In sql developer the columns of v1 is defined as:
PRODUCT_ID     VARCHAR2(24)     Yes          2
DESCRIPTION     VARCHAR2(120)     Yes          3
AS_AT_DATE     DATE     Yes          4
SOURCE_ID     VARCHAR2(64)     Yes          1
In sqlplus or sqldeveloper,
desc v1
Name Null Type
SOURCE_ID VARCHAR2(16 CHAR)
PRODUCT_ID VARCHAR2(6 CHAR)
DESCRIPTION VARCHAR2(30 CHAR)
AS_AT_DATE DATE
Does anyone have any ideas ?

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Cannot reproduce what you are saying is happening.
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Table created.
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Materialized view created.
SQL> desc tmv
Name                                      Null?    Type
A                                                  NVARCHAR2(50)
B                                                  NVARCHAR2(50)
C                                                  NVARCHAR2(100)
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Materialized view dropped.
SQL> create materialized view tmv as
2 select a, b, substr(a || b, 1, 10) c from t;
Materialized view created.
SQL> desc tmv
Name                                      Null?    Type
A                                                  NVARCHAR2(50)
B                                                  NVARCHAR2(50)
C                                                  NVARCHAR2(10)
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
CORE    11.1.0.7.0      Production
TNS for Linux: Version 11.1.0.7.0 - Production
NLSRTL Version 11.1.0.7.0 - Production
SQL>Edited by: 3360 on Jan 25, 2011 8:10 AM
And with data
SQL> insert into t values ('3123423423143hhshgvcdcvw', 'ydgeew gdfwe   dfefde wfjjjjjjj');
1 row created.
SQL> commit;
Commit complete.
SQL> desc tmv
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A                                                  NVARCHAR2(50)
B                                                  NVARCHAR2(50)
C                                                  NVARCHAR2(10)
SQL> select * from tmv;
A
B                                                  C
3123423423143hhshgvcdcvw
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