Can a number column have spaces in it?

Dear All,
Summing the amount column gives me different totals when i do trim or to_number.
Select sum(amount) from premium_transaction
where load_date = '18-jun-2007';
2220732.34
Select sum(to_number(amount)) from premium_transaction
where load_date = '18-jun-2007'
2226892.63
Select sum(trim(amount)) from premium_transaction
where load_date = '18-jun-2007'
2226892.63
I am assuming that some of the values in the amount column has spaces in it. If it has spaces wouldn't sum function convert implicitly to number before computing.
Please shed some light on this.
Thank you,
Siri

I am sorry for the late response. I was pulled into bunch of other stuff.
Thanks so much for the feedback. The analytic function along with dump function helped me in tracking down the actual rows and values that are behaving differently, although i couldn't figure out the pattern of the behavior.
Below are the sample data:
SELECT premium_amount,
       TO_NUMBER(premium_amount),
       TRIM(premium_amount)
FROM truecomp_premium_tbl
WHERE policy_no IN (2938891, 2942878, 2937642)
   AND data_source = 'TAPPDOUT'
PREMIUM_AMOUNT     TO_NUMBER(PREMIUM_AMOUNT)     TRIM(PREMIUM_AMOUNT)
-9.32     -9.32     -0000009.32
-30.04     0.00     -0000000
-67.46     0.00     -0000000
SELECT policy_no,
       premium_amount,
       SUM(premium_amount) OVER (ORDER BY ROWNUM) AS the_sum,
       SUM(TO_NUMBER(premium_amount)) OVER (ORDER BY ROWNUM) AS the_sum2,
       SUM(TRIM(premium_amount)) OVER (ORDER BY ROWNUM) AS the_sum3,
       DUMP(premium_amount) AS the_dump,
       DUMP(premium_amount,1017) AS the_dump
FROM (SELECT policy_no, ROWNUM rn,
               premium_amount
          FROM webclient.truecomp_premium_tbl
         WHERE commission_date = TO_DATE('18-June-2007')
           AND data_source = 'TAPPDOUT') t
ORDER BY rn
POLICY_NO     PREMIUM_AMOUNT     THE_SUM     THE_SUM2     THE_SUM3     THE_DUMP                                            THE_DUMP_1
2,916,092             -29.58      -29.58       -29.58       -29.58     Typ=2 Len=7: 59,101,101,101,72,43,102     Typ=2 Len=7: ;,e,e,e,H,+,f
2,924,967             -15.11      -44.69       -44.69       -44.69     Typ=2 Len=7: 59,101,101,101,86,90,102     Typ=2 Len=7: ;,e,e,e,V,Z,f
2,930,793            -188.32     -233.01      -233.01      -233.01     Typ=2 Len=7: 59,101,101,100,13,69,102     Typ=2 Len=7: ;,e,e,d,^M,E,f
2,935,006            -469.00     -702.01      -702.01      -702.01     Typ=2 Len=6: 59,101,101,97,32,102     Typ=2 Len=6: ;,e,e,a, ,f
2,937,642              -9.32     -711.33      -711.33      -711.33     Typ=2 Len=7: 59,101,101,101,92,69,102     Typ=2 Len=7: ;,e,e,e,\,E,f
2,938,891            -30.04     -743.42      -711.33      -711.33     Typ=2 Len=7: 59,101,101,101,70,197,102     Typ=2 Len=7: ;,e,e,e,F,c5,f
2,942,878             -67.46     -812.93      -711.33      -711.33     Typ=2 Len=7: 59,101,101,101,32,255,102     Typ=2 Len=7: ;,e,e,e, ,ff,f
2,943,529            -175.68 -988.61      -887.01      -887.01     Typ=2 Len=7: 59,101,101,100,26,33,102     Typ=2 Len=7: ;,e,e,d,^Z,!,f
2,946,041           -127.88-1,116.49-1,014.89 -1,014.89     Typ=2 Len=5: 61,100,74,13,10            Typ=2 Len=5: =,d,J,^M,f
2,955,186             -21.60-1,138.09-1,036.49 -1,036.49     Typ=2 Len=7: 59,101,101,101,80,41,102     Typ=2 Len=7: ;,e,e,e,P,),f
2,957,617            -25.32-1,163.41-1,061.81 -1,061.81     Typ=2 Len=7: 59,101,101,101,76,69,102     Typ=2 Len=7: ;,e,e,e,L,E,f
2,957,827             -52.20-1,215.61-1,114.01 -1,114.01     Typ=2 Len=7: 59,101,101,101,49,81,102     Typ=2 Len=7: ;,e,e,e,1,Q,f
Thank you,
Siri

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