Question about PGN variations

Hi!

I hope this question fits in here - if not im sorry.

I just downloaded CBase Chess on my iPhone and I was going through a game to learn when suddenly a window popped up: "Select variation"... I have now the choice between two different moves.

As the games were actually played (linares_2001) it doesn't make any sense to me. I doubt that the opponents tried different times from a specific point of the game...

The pgn file has embedded variations. The game either has been analyzed by someone, with suggestions on what could have happened, or via an engine for the same reason. I don't know about that program but usually the first move listed is the one played in the game.

Thanks. :-)