"order by" and "order by asc" returning different results on date field

I have a table that I'm using to log results from my system. It has a
field "created timestamp default current_timestamp."

Running the query "select * from tbl_log order by created asc;" works as
expected.

Running the query "select * from tbl_log order by created;" returns sorted
chunks of 2000 records.

Regards,
Rick Gentry
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Zenus, Inc.