In many of the cases, there are issues where Server Group functionality doesn't work as expected.
For example, FTS Search does not work after completing a Full Text Reindex, Approvals do not get processed, and the Email Engine intermittently fails.
In many of such cases, the AR Servers are not configured correctly across the Server Group, resulting in multiple different environments (DEV, QA & PROD) AR Server entries being configured in the AR System Server Group Operation Ranking form.

The same entries from multiple environments are visible in the servgrp_board AR System database table and the driver.exe utility.
As in the example below, several servers in the server group have a ranking of 1 for various operations in the OpsFlag property:

Issues also arise when there are duplicate AR Server entries in the AR System Server Group Operation Ranking form and servgrp_board table; for example, the server short name as well as the server FQDN.
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