Steps to reproduce:

1. add dependent item to LLD (see "dependent item.png"). Use a separate application for them (like "TEST")
2. wait until Zabbix will add them
3. open list of items and filer by the application
4. select some them to highlight and note current position/order (see order1.png)
5. refresh the page (see order2.png)

Result:
Frontend will display them in a different place. They are not sorted by name

Expected:
The items should be sorted by name.