Hello,
I have SQL HA group with 2 nodes (SQLNODE1, SQLNODE2) and witness (WSFCNode). I setup to SQLNODE1 to be prefered owner in properties of role (SQNODE1 followed by SQLNODE2). HAGroup is setup as Automatic Failover.
Everything works as expected and if I do say reboot SQLNODE1 it fails over to SQLNODE2 as expected. The problem is that it does not fail back over to SQLNODE1 once reboot is completed. Also at that point SQLNODE2 appears to move up on top of SQLNODE1 in prefered owners role.
Automatic Failback is configured per default settings which allows to failback immediately.