Graph Lines Pointing Inward

Any idea why the outer edges of my graphs are pointing inwards?

Below is an example query.

    WITH table_data_epo AS (
SELECT
 $__timeGroup(created_at, $__interval, 0) AS epo,
 cast(count(*) AS int)AS value
FROM
  public."Metric"
 WHERE 
 event = 'test_query'
GROUP BY 
epo
ORDER BY
epo desc
),  
table_data_timestamp AS ( 
    SELECT
        value,
        to_timestamp(epo) AS time 
    FROM
        table_data_epo) 
    SELECT
		value,
		time
    FROM
        table_data_timestamp 
    WHERE  
        $__timeFilter(time)

I found that removing the “0” argument from the $__timeGroup method resolves this issue.

$__timeGroup(created_at, $__interval, 0)