Redshift order by DESC is not working

I tested below and I see that ordering is properly applied highest to lowest. Can you check if timestamp_column is defined as timestamp not string?

create table test_ts_order
(timestamp_column  timestamp);

insert into test_ts_order 
select getdate()
--wait few seconds
insert into test_ts_order 
select getdate()
--wait few seconds
insert into test_ts_order 
select getdate()

select * from test_ts_order order by timestamp_column desc;

• 2022-11-11 21:47:09
• 2022-11-11 21:46:47
• 2022-11-11 21:46:22

select version()

PostgreSQL 8.0.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3), Redshift 1.0.43331