The extra beat in the first measure is a pickup beat and should go in its own bar. The translation program -- or else ABC -- has trouble with that. I transcribed it in G, and Si sings it lower, I'm pretty sure, but the note you are questioning in the chorus is right, it happens right after the clip ends (on So or 5 of the scale) and the next note is La or 6. (The verse is in the middle of the clip, and the chorus at both ends, right?)
I did exercise a little liberty in how I transcribed Si's slurred notes, so those may not be exact.I just went and listened to it transcribed back, and a couple of the slurs are off, but other than that, the tune is right. Perhaps I have held the second line of the chorus too long. I will check later this evening, and maybe eliminate the grace notes.
Blessings,
Barbara