I recently started playing the Granados Spanish Dances, and I ran into a problem that I've never encountered before. While reading through the 7th Spanish Dance (Valenciana o Calesera, in G), I found a number of notes that just sounded wrong. They were usually in the upper register and to my ears were always missing sharps. Of course I might just be wrong, and those notes were exactly what Granados had intended. So I listened to a recording of Alicia de la Rocha playing the same piece. She played the notes that I thought sounded right. So either she has the 'correct' version of this composition, or she did exactly what I'm doing - playing what she thinks Granados intended. I also noticed that she made other alterations to the piece; the ending is slightly different, and she sometimes plays octaves in the bass where the music indicates single notes.
What's going on here?

In my admittedly limited experience I've never run into wrong-note typos in musical compositions. The worst I've seen is what I'd call misinterpretations of either ornaments, fingering, or use of pedals. Could I have a bad version of the piece (mine was published by International Music Company, New York)? If so, does anyone know how I could find the correct version?