Knut's function "elelments"

Need help with Knut's function for  summing values in rows 
here is my example:
WITH T1 (C1) AS
(VALUES ('1'),
       ('1.1'),
       ('1.2.1.2'),
       ('1.10.1'),
       ('1.10.1.2.2'),
       ('1.22.99.1'),
       ('1.2'),
       ('1.3.3.7.4'),  
       ('1.3.2.7'),
       ('1.4.1')),
T2(ALL_SUM) AS 
 (SELECT REPLACE(C1,'.','+') FROM T1)
select all_sum, sum(int(substr(all_sum, index-1,1))) FROM T2,
TABLE (elements(RTRIM(T2.all_sum)|| '+')) x 
where ordinal > 0 
group by all_sum
ORDER BY 1;

output:

ALL_SUM        2          
----------        -----------
1                      1
1+1                  2
1+10+1             2
1+10+1+2+2     6
1+2                  3
1+2+1+2           6
1+22+99+1      13
1+3+2+7          13
1+3+3+7+4      18
1+4+1               6

 10 record(s) selected.
why it is summing wrong?

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