Obvious data mismatch in View2 which basically SELECT * from View1

Dear list,

Recently I am getting feedback, data in my analytic report is not
repeatable. From time to time they get different data for the same time
span.
(but IIRC previously it was OK). Therefore I started debuging the View
chain for that report, during which I bumped into this issue/phenomenon.

In a over -simplified version:

CREATE VIEW2 AS SELECT * FROM VIEW1;
SELECT  col1 FROM VIEW2 WHERE cond1=True;
SELECT  col1 FROM VIEW1 WHERE cond1=True;

Now col1 from both views looks different. I don't know where to start to
solve this problem.

The actual situation is a bit more than that, the following is the
actual query:

    -- trying to audit utlog weighed stat
    with t as (
    select '2020-07-01 00:00:00'::timestamp t0, '2020--07-02
0:0:0'::timestamp t1
    )
    --select * from t;
    select *
    -- from utlog.cache_stats_per_shift_per_reason_weighed_stats
    -- from utlog.stats_per_shift_filtered_per_reason
    from utlog.stats_per_shift_filtered                     (let's call
it #View2 for short)
    -- from utlog.stats_per_shift_filtered_b0206      (let's call it
#View1 for short)
    -- from utlog.stats_per_shift
    cross join t
    where wline = 'F02'  and wts >= t.t0 and wts < t.t1 and wsft ='D'
    limit 100
    ;

The Result for #View2

    wts                 | wsft | wspan  | wstate | wline | rcodes
    --------------------+------+--------+--------+-------+-------
    2020-07-01 08:00:00 | D    |      0 | S00    | F02   | {PDCB}
    2020-07-01 09:50:01 | D    | 12.533 | S00    | F02   | {PDCB}
    2020-07-01 11:35:46 | D    | 12.217 | S00    | F02   | {CDSO}
    2020-07-01 13:22:58 | D    |   5.15 | S00    | F02   | {PDCB}
    2020-07-01 14:57:38 | D    |    6.8 | S00    | F02   | {PDCB}

    INDEX | COLUMN_NAME | DATA_TYPE
    ------+-------------+------------
    1     | wts         | timestamptz
    3     | wsft        | varchar
    4     | wspan       | float8
    5     | wstate      | varchar
    6     | wline       | varchar
    7     | rcodes      | text[]

Same query, the Result for #View1

    wts                 | wsft | wspan | wstate | wline | rcodes
    --------------------+------+-------+--------+-------+-------
    2020-07-01 08:00:00 | D    |     5 | S00    | F02   | {PDCB}
    2020-07-01 09:50:01 | D    |    13 | S00    | F02   | {PDCB}
    2020-07-01 11:35:46 | D    |    12 | S00    | F02   | {CDSO}
    2020-07-01 13:22:58 | D    |     5 | S00    | F02   | {PDCB}
    2020-07-01 14:57:38 | D    |     7 | S00    | F02   | {PDCB}

    INDEX | COLUMN_NAME | DATA_TYPE
    ------+-------------+------------
    1     | wts         | timestamptz
    3     | wsft        | varchar
    4     | wspan       | float8
    5     | wstate      | varchar
    6     | wline       | varchar
    7     | rcodes      | varchar[]

Reuslts in `wspan` column is inaccurate while both type are float8. Most
weird thing is the 5 to 0 change. for Row 1.

The `_b0206`(#View1) is just a version of
`stats_per_shift_filtered`(#View2) from past revisions.
I am sure the original CREATE statement for (#View2) is `CREATE VIEW ...
AS SELECT * FROM ...._b0206`

Definition of View2 in SQLWorkbench/J generated schema:

    CREATE OR REPLACE VIEW utlog.stats_per_shift_filtered (#View2)
    (
    wts,
    wdate,
    wsft,
    wspan,
    wstate,
    wline,
    rcodes
    )
    AS
    SELECT stats_per_shift_filtered_u0206.wts,
        stats_per_shift_filtered_u0206.wsft::character varying AS wsft,
        stats_per_shift_filtered_u0206.wspan,
        stats_per_shift_filtered_u0206.wstate,
        stats_per_shift_filtered_u0206.wline,
        stats_per_shift_filtered_u0206.rcodes
    FROM utlog.stats_per_shift_filtered_u0206;  (as #View1 in this post)

It feels like the utlog.stats_per_shift_filtered_u0206 in
utlog.stats_per_shift_filtered definition is a different object from
utlog.stats_per_shift_filtered_u0206?

I am totally out of clues. Any help would be appreciated. Thanks.

Regards,

Ben