Why?

I was studying openings and i found this game. Can someone explain me why the GM's played 4. Ng1 Nb8 ??lichess.org/1WE0Rzt6

@Diego-Alexander
He wants to protect his horsey.
Anyway, Idk why he moved this probably mouse slip or hand slip?

It's a lichess imported game and i think these are otb games but idk really

Obviously some sort of shenanigans were involved.

If it was a otb game, maybe the notation got messed up.

@InkyDarkBird its not a game he played he wants to report a png bug.
and this goes in the lichess feedback... XD

@Checkmate_david Wait... Was that a pgn bug? i didn't know that, thanks

A descriptive title

✅ A descriptive title: “Tournaments Feature Request: Variant = From position"

❌ “Help” , “Bug”, “bye bye” , “bullet” , “play”

Source : lichess.org/page/forum-etiquette

HAHA lol. They placed their horses back and infront again