Oops... looks like the spiders padded through here
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/lobby and /hub are registered on the proxy so a player on any server can get back to a lobby. When the player running them is already on a registered lobby, the proxy has nothing to do — moving them would send them to the server they are standing on — so it replies that they are already in a lobby and stops there.
Stopping is what lets the lobby side answer instead. On a lobby, /lobbies opens the lobby selector so the player can pick a different one, which is the useful thing to do from inside a lobby.
The message is in your translations file on the proxy, under already-in-lobby. Set it to '' to say nothing at all.
To give players a /hub that opens the selector rather than connecting, turn off the built-in one and point a renamed command or a hotbar item at [MENU] lobbies instead.
A player who is on another server entirely — survival, minigames — is connected to the lobby holding the fewest players, which is what these commands are for.
Oops... looks like the spiders padded through here
Add products to your cart and remove them from here Lets buy