You might have a character that might not be a space.

You can check which character is with this code (it's untested, but it should work).

WITH E1(N) AS (

SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL

SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL

SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1

), --10E+1 or 10 rows

E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E+2 or 100 rows

cteTally(N) AS (

SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E2

)

SELECT SUBSTRING(ResultsText, N, 1), ASCII(SUBSTRING(ResultsText, N, 1))

FROM SampleData

CROSS JOIN cteTally

ORDER BY ResultsText, N