sql server - Group By not grouping as expected? -


i'm trying calculate monthly sum, using query. 

select      fld_year     , fld_month     , convert(nvarchar(7), fld_consdate, 121) fld_consdate     , fld_consumptionvalue     , fld_id (     select          year(dateadd(minute, fld_tzam - 6360, fld_consdatetime)) fld_year         , month(dateadd(minute, fld_tzam- 6360, fld_consdatetime)) fld_month         , dateadd(month, datediff(month, 0, fld_consdatetime), 0) fld_consdate         , sum(fld_energytotalindexvalue) fld_consumptionvalue         , max(fld_id) fld_id     tbl_em_deviceenergyhourlyconsumption     fld_deleted = 0         , fld_active = 1         , fld_calculationstate = 2         , fld_deviceid in (18)         , fld_consdatetime >= dateadd(minute, -1*(fld_tzam) + 6360, '2017-05-01 00:00:00')         , fld_consdatetime < dateadd(minute, -1*(fld_tzam) + 6360, '2017-08-01 00:00:00')         , fld_deviceorganizationid in (select value dbo.fn_organizationsublist(2))     group          year(dateadd(minute, fld_tzam - 6360, fld_consdatetime)),          month(dateadd(minute, fld_tzam - 6360, fld_consdatetime)),         dateadd(month, datediff(month, 0, fld_consdatetime), 0), )t order fld_consdate asc

the result expect 

fld_year   fld_month     fld_consdate     fld_consumptionvalue   fld_id  2017          5            2017-05              294.1340             2017          6            2017-06              222.7527             2017          7            2017-07              318.2111

but instead 2 values each month

fld_year   fld_month     fld_consdate     fld_consumptionvalue   fld_id    2017          5            2017-05              260.2158               2017          6            2017-06              193.4958               2017          5            2017-06              33.9182    2017          6            2017-07              29.2569               2017          7            2017-07              264.8147               2017          7            2017-08              53.3964

i can't seem figure out tips me? can show me logic gone wrong? in advance!

if want 1 row per month, why including third aggregation key? seem want:

   select year(dateadd(minute, fld_tzam - 6360, fld_consdatetime)) fld_year,           month(dateadd(minute, fld_tzam - 6360, fld_consdatetime)) fld_month,           dateadd(month, datediff(month, 0, min(fld_consdatetime)), 0) fld_consdate,           . . .     group year(dateadd(minute, fld_tzam - 6360, fld_consdatetime)),               month(dateadd(minute, fld_tzam - 6360, fld_consdatetime))

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