Issue with retrieving data when the column has @- in it's value

Hello Admins,

I have an issue where in the same scenario below works on my POC but is having an issue in the original db.

Original db - OS : Red Hat   (postgres13)

POC db - OS : SUSE    (postgres 14)

SELECT char_length("col1"), octet_length("col1"), "col1"
FROM "test_col" WHERE "col1" = 'test_level@-1';

The above query returns data in POC, however, on orig db, it does not return any data.

On orig db, I have to either a dd trim or COLLATE "C" for it to return data.

The collation is same on both the dbs (en_US.UTF-8) and the os locate is also the same on both.

Column col1 datatype is varchar.

I tried checking if there are any spaces or special characters and did not see anything in the output. 

SELECT char_length("col1"), octet_length("col1"), length("col1"), encode("col1"::bytea, 'escape')
FROM "test_col" WHERE "col1" = 'test_level@-1';

output is the same for both:

 char_length | octet_length | length |    encode
-------------+--------------+--------+---------------
          13 |           13 |     13 | test_level@-1

Can anyone guide me on what else can be checked?