Screenshot to believe me: imgur.com/a/AwrL3OY
As you can see, Nc3 and c3 lines, both, appear twice in the 5 move list, so there is actually only 3 moves.
You can try putting the same fen in the analysis window: FEN r1bqkb1r/ppp2ppp/8/2pnP3/3P4/8/PPP2PPP/RNBQKB1R w KQkq - 0 7
I did it for you: lichess.org/analysis/standard/r1bqkb1r/ppp2ppp/8/2pnP3/3P4/8/PPP2PPP/RNBQKB1R_w_KQkq_-_0_7
As you can see, Nc3 and c3 lines, both, appear twice in the 5 move list, so there is actually only 3 moves.
You can try putting the same fen in the analysis window: FEN r1bqkb1r/ppp2ppp/8/2pnP3/3P4/8/PPP2PPP/RNBQKB1R w KQkq - 0 7
I did it for you: lichess.org/analysis/standard/r1bqkb1r/ppp2ppp/8/2pnP3/3P4/8/PPP2PPP/RNBQKB1R_w_KQkq_-_0_7