comparing output of internal pg tables of referenced tables

Hey,
I tried to get a list of all tables that has a reference to my_table. I
used two different queries :

1)select R.*
from INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE u
inner join INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS FK
    on U.CONSTRAINT_CATALOG = FK.UNIQUE_CONSTRAINT_CATALOG
    and U.CONSTRAINT_SCHEMA = FK.UNIQUE_CONSTRAINT_SCHEMA
    and U.CONSTRAINT_NAME = FK.UNIQUE_CONSTRAINT_NAME
inner join INFORMATION_SCHEMA.KEY_COLUMN_USAGE R
    ON R.CONSTRAINT_CATALOG = FK.CONSTRAINT_CATALOG
    AND R.CONSTRAINT_SCHEMA = FK.CONSTRAINT_SCHEMA
    AND R.CONSTRAINT_NAME = FK.CONSTRAINT_NAME
  AND U.TABLE_NAME = '*my_table*'

2)select conname,  (select r.relname from pg_class r where r.oid =
c.confrelid) as orig_table,    (select array_agg(attname) from pg_attribute
   where attrelid = c.confrelid and ARRAY[attnum] <@ c.conkey) as
orig_cols,  (select r.relname from pg_class r where r.oid = c.conrelid) as
foreign_table,      (select array_agg(attname) from pg_attribute    where
attrelid = c.conrelid and ARRAY[attnum] <@ c.conkey) as foreign_cols from
pg_constraint c   where c.confrelid = (select oid from pg_class where
relname = '*my_table*') and c.contype='f'

On the second output in the orig_cols I got a few weird outputs like
: {........pg.dropped.5........} or even a columns that doesnt have a
unique index (just a random column from the orig_table).

tried to vacuum the table but still didnt help. The db is at version 9, but
I tried to upgrade it to 10/11/12 and in all versions it stayed the same.

;