Best guess is, something on your network won the election, but has a firewall/security software that prevents other clients from connecting to it to obtain the list of devices in the workgroup.
Beyond that I have no idea, sorry.
Asuswrt-Merlin: Customized firmware for Asus routers
Github: github.com/RMerl - Twitter: RMerlinDev
See the sticky post for more info.