Time anomaly in mysql table version 5.5.62-log

Hello there,

I need your help.

This is part of my table on MySQL database

I realized that in this case more than one hour has passed between the previous and the next row

mysql> SELECT
	TIMEDIFF(
		'2020-04-20 16:00:00',
		'2020-04-20 14:58:56'
	);+------------------------------------------------------------------+
| TIMEDIFF(
		'2020-04-20 16:00:00',
		'2020-04-20 14:58:56'
	) |+------------------------------------------------------------------+
| 01:01:04                                                         |+------------------------------------------------------------------+
1 row in set

mysql> 

this is not possible because the data is downloaded maximum from the source every five minutes

I have tried this query without success because the return is all zero

SELECT
	`sDatetime`,
	`sElement`,
	`sDescri`,
	MAX(
		TIME_TO_SEC(
			TIMEDIFF(
				`sDatetime`,
				`sDatetime`
			)
		)
	) AS 'Worst',
	MIN(
		TIME_TO_SEC(
			TIMEDIFF(
				`sDatetime`,
				`sDatetime`
			)
		)
	) AS 'Best',
	AVG(
		TIME_TO_SEC(
			TIMEDIFF(
				`sDatetime`,
				`sDatetime`
			)
		)
	) AS 'Average'
FROM
	tbl_2020
GROUP BY
	`sDatetime`,
	`sElement`,
	`sDescri`;

how can i find this anomaly in mysql table?

my version of MySQL is 5.5.62-log

 the name of column is sDatetime the type is Datetime.

I need extract all rows when the datediff from rows is more than an hour... the example is in question

any suggestion, please?

thanks in advance for any help