Select distinct on declared table - sql-server

Question

I need to create concatenated query will get data with checking data in other tables.
Firstly I declared (and filled it) two tables with list of ID I'll check in other tables. On next step (2) I declared new table and filled it values I get by some checking params. This table contains only one column (ID).
After filling if I execute SELECT DISTINCT query from this table I'll get really unique ID. It's OK.
But on next step (3) I declare more one table and filling it by 3 tables. Of course it contains many duplicates. But I must create this query for checking and concatenating. And after that if I execute select distinct h from #NonUnicalConcat it returns many duplicate IDs.
What I did wrong? Where is an error?
USE CurrentBase;
--STEP 1
DECLARE #TempCSTable TABLE(TempTableIDColumn int);
INSERT INTO #TempCSTable VALUES('3'),('4');
DECLARE #TempCVTable TABLE(TempTableIDColumn int);
INSERT INTO #TempCVTable VALUES('2'),('13');
--STEP 2
DECLARE #TempIdTable TABLE(id int);
INSERT INTO #TempIdTable
SELECT TT1.ID
FROM Table1 AS TT1
LEFT OUTER JOIN Table2 ON Table2.ID = TT1.OptionalColumn
LEFT OUTER JOIN Table3 AS TT2 ON TT2.ID = TT1.OptionalColumn
LEFT OUTER JOIN Table4 AS TT3 ON TT3.ID = TT2.OptionalColumn
WHERE TT1.ValueDate > '2020-06-30'
AND TT1.ValueDate < '2020-08-04'
AND TT1.OptBool = '1'
AND TT1.OptBool2 = '0'
AND EXISTS
(
SELECT Table5.ID
FROM Table5
WHERE Table5.ID = TT1.ID
AND Table5.CV IN
(
SELECT TempTableIDColumn
FROM #TempCVTable
)
AND Table5.OptBool = '1'
)
AND EXISTS
(
SELECT Table6.ID
FROM Table6
WHERE Table6.IID = TT3.ID
AND Table6.CS IN
(
SELECT TempTableIDColumn
FROM #TempCSTable
)
);
SELECT distinct * FROM #TempIdTable;--this code realy select distinct
--STEP 3
DECLARE #NonUnicalConcat TABLE(c int, s int, h int);
INSERT INTO #NonUnicalConcat
SELECT TT1.TempTableIDColumn AS cc,
TT2.TempTableIDColumn AS ss,
TT3.id AS hh
FROM #TempCVTable AS TT1,
#TempCSTable AS TT2,
#TempIdTable AS TT3
WHERE NOT EXISTS
(
SELECT HID
FROM OtherBase.dbo.Table1
WHERE HID = TT3.id
AND CS = TT2.TempTableIDColumn
AND CV = TT1.TempTableIDColumn
);
select distinct h from #NonUnicalConcat;--this code return many duplicates