Steps to reproduce:

1. Generates a problem event in the order of host1, host2, and host3.
   host1, host2, and host3 belong to the same host group "test".
2. The "problem event" that occurred.

   MariaDB [zabbix]> select e.eventid,from_unixtime(e.clock),h.host from events e join functions f on f.triggerid = e.objectid join items i on i.itemid=f.itemid join hosts h on h.hostid=i.hostid where e.source=0 and e.object=0 and e.name like 't1' order by e.eventid desc;
   +---------+------------------------+-------+
   | eventid | from_unixtime(e.clock) | host  |
   +---------+------------------------+-------+
   |      16 | 2024-05-28 11:47:49    | host3 |
   |      13 | 2024-05-28 11:47:47    | host2 |
   |       8 | 2024-05-28 11:47:44    | host1 |
   |       5 | 2024-05-28 11:47:42    | host3 |
   |       2 | 2024-05-28 11:47:38    | host2 |
   |       1 | 2024-05-28 11:46:59    | host1 |
   +---------+------------------------+-------+
   6 rows in set (0.001 sec)
   MariaDB [zabbix]> select e.eventid,from_unixtime(e.clock),h.host from problem e join functions f on f.triggerid = e.objectid join items i on i.itemid=f.itemid join hosts h on h.hostid=i.hostid where e.source=0 and e.object=0 and e.name like 't1' order by e.eventid desc;
   +---------+------------------------+-------+
   | eventid | from_unixtime(e.clock) | host  |
   +---------+------------------------+-------+
   |      16 | 2024-05-28 11:47:49    | host3 |
   |      13 | 2024-05-28 11:47:47    | host2 |
   |       8 | 2024-05-28 11:47:44    | host1 |
   |       5 | 2024-05-28 11:47:42    | host3 |
   |       2 | 2024-05-28 11:47:38    | host2 |
   |       1 | 2024-05-28 11:46:59    | host1 |
   +---------+------------------------+-------+
   6 rows in set (0.001 sec)
   

1. Assuming that the time has returned to the past due to OS time synchronization, change the clock of eventid:2.
   2024-05-28 11:47:38 => 2024-05-28 11:47:43

   MariaDB [zabbix]> select e.eventid,from_unixtime(e.clock),h.host from events e join functions f on f.triggerid = e.objectid join items i on i.itemid=f.itemid join hosts h on h.hostid=i.hostid where e.source=0 and e.object=0 and e.name like 't1' order by e.eventid desc;
   +---------+------------------------+-------+
   | eventid | from_unixtime(e.clock) | host  |
   +---------+------------------------+-------+
   |      16 | 2024-05-28 11:47:49    | host3 |
   |      13 | 2024-05-28 11:47:47    | host2 |
   |       8 | 2024-05-28 11:47:44    | host1 |
   |       5 | 2024-05-28 11:47:42    | host3 |
   |       2 | 2024-05-28 11:47:43    | host2 |
   |       1 | 2024-05-28 11:46:59    | host1 |
   +---------+------------------------+-------+
   6 rows in set (0.001 sec)
   MariaDB [zabbix]> select e.eventid,from_unixtime(e.clock),h.host from problem e join functions f on f.triggerid = e.objectid join items i on i.itemid=f.itemid join hosts h on h.hostid=i.hostid where e.source=0 and e.object=0 and e.name like 't1' order by e.eventid desc;
   +---------+------------------------+-------+
   | eventid | from_unixtime(e.clock) | host  |
   +---------+------------------------+-------+
   |      16 | 2024-05-28 11:47:49    | host3 |
   |      13 | 2024-05-28 11:47:47    | host2 |
   |       8 | 2024-05-28 11:47:44    | host1 |
   |       5 | 2024-05-28 11:47:42    | host3 |
   |       2 | 2024-05-28 11:47:43    | host2 |
   |       1 | 2024-05-28 11:46:59    | host1 |
   +---------+------------------------+-------+
   6 rows in set (0.001 sec)
   

Result:

1. "Monitoring" => "Problems"
   11:47:49 host3
   11:47:47 host2
   11:47:44 host1
   11:47:43 host2
   11:47:42 host3
   11:46:59 host1

Events are displayed in time order.

1. "Monitoring" => "Dashboard" => "Problems by severity"
   11:47:49 host3
   11:47:47 host2
   11:47:44 host1
   11:47:42 host3
   11:47:43 host2
   11:46:59 host1

Events are listed in descending order by eventid.

1. Change "Show" to "Totals" in "Problems by severity".
   Change host group "zzz" on host3.
2. "Monitoring" => "Problems" display order remains the same.
3. "Monitoring" => "Dashboard" => "Problems by severity"
   11:47:47 host2
   11:47:44 host1
   11:47:43 host2
   11:46:59 host1
   11:47:49 host3
   11:47:42 host3
4. Change host group "aaa" on host3.
   "Monitoring" => "Dashboard" => "Problems by severity"
   11:47:49 host3
   11:47:42 host3
   11:47:47 host2
   11:47:44 host1
   11:47:43 host2
   11:46:59 host1

It appears that the host group name affects the display order.

Expected:
The "Time" is arrow-down on the screen.
Shouldn't events be listed in time order?