[SQL] Google Cloud SQL: Column Does Not Exist Error When Inserting Row

I have a SQL table on Google Cloud (which I will call table_name here). It has three columns, which I will refer to as:

1. col_1 (with data type 'character varying')
2. col_2 (with data type 'character varying')
3. col_3 (with data type 'timestamp without time zone')

I am trying to enter a new row with the following query: insert into table_name (col_1, col_2, col_3) values ("some_string", "some_string_2", "2021-08-01 04:28:00");

However, it is returning an error with the message: column "some_string" does not exist

All of the data types should be correct, and I'm pretty sure the syntax of this query is correct, so what could be happening here?

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