Looks like you have under-lines issues (vifmgr/Node) and therefore when the LIF fails-over it is not reachable. Ideally, even if the LIFs fail-over, they should be reachable. However, if you want LIFs to go back to its home-port then auto-revert is the property that will turn on.
I see the issue in the output you shared:
Warning: Unable to list entries for vifmgr on node "FNC-01": RPC: Port Mapper failure. Therefore, it's only listing ports for Node FNC-02. Perhaps, that's why all your LIFs are attached to this Node.
Try to check:
::> set adv
Warning: These advanced commands are potentially dangerous; use them only when directed to do so by NetApp personnel.
Do you want to continue? {y|n}: y
::*> cluster ring show -unitname vifmgr
I would request you to log a ticket with NetApp Phone support.
Thanks!