That is not how you post results of command execution. You do not describe - you copy and paste here the full command and its complete output.
Anyway, that is the reason your filesytems are unmounted. There is /usr/lib/NetworkManager/dispatcher.d/nfs script that unconditionally unmounts when interfaces go down, but only mounts back when nfs-client.target is enabled.
I suppose, the simplest fix would be to enable this unit.