Localhost as top client, why

My Pihole 5.11 is installed on a Debian in a virtual HyperV on Windows 11.
The host machine is identified as Pc-Obs.
Conditional Forward is activated.

My Top Client list on the dashboard shows the localhost as the top user as shwon here

What is locahost here ? My virtual Debian host ?

When i look at the requests managed by localhost i see that :

Only arpa domain.

Also, localhost was at the top before the activation of conditional fowarding but i will try to search if the request were also on arpa domain...

Edit : so here are the kind of request before conditional forwarding

So now its only arpa requests sent to the DHCP server.
Before it was only different domain sent to the gateway.

maybe that's fully normal....

Is that normal ?
Should i ignore that ?
If yes, How to ignore ?

Thanks for your advices.

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