Why is the last semiquaver outside the last triplet of the measure?

Question

The following measure is from "Clair De Lune ~ Adagio Sostenuto de la Sonata Op. 27 N. 2 De Beethoven", guitar sheet music .

Correct me if I'm wrong but the last semiquaver isn't going to be played, right?

Lets say each quaver is getting one foot tap. Foot tap for F and dotted A, a second on D and the final foot tap for F. Correct?

Why did the notation software add the last semiquaver after the "vertical axis" of F note? why it is not aligned under the F ?

[Update]
Time signature: 4/4

Answer 1

Why is the last semiquaver outside the last triplet of the measure?
Because it should be!
You can think of the last quarter beat of the measure as being divided into three voices:
a) An eighth rest and two eighth notes (D5¹ and F5)
b) A dotted eighth note and a sixteenth note (A4 and A4)
c) A quarter note (F3)
The last eighth note of voice a) should be placed approximately one third from the end of an imagined full quarter note length, while the sixteenth note of voice b) should be placed one quarter from the end of this imagined length.

The last semiquaver isn't going to be played, right?
Wrong! Voice b) is the melody! The other notes are (mainly) accompaniment.²
Listen to this recording and you will understand how it should be played. The sheet music or notation used for that recording might not be identical to yours, but you should get the idea.

The music, "Piano Sonata No. 14" (in C sharp) by Ludwig van Beethoven, is a piano sonata that in your sheet music has been adapted for the guitar. It is nicknamed the Moonlight Sonata, (or in French Sonate au clair de lune).

¹_{The notes sounding on the guitar is actually one octave down, but I chose here to write the octave numberings generally associated with the lines of the staff.}
²_{This is a slight overstatement in order to emphasize the importance of voice b).}

Answer 2

Even though this question has already long been answered, I thought I would show a picture of the note durations in case it helps someone. The time of a single quarter note can be filled many ways:

|___________| : One quarter note
|_____|_____| : Two eighth notes
|___|___|___| : Three triplets
|__|__|__|__| : Four sixteenth notes

So the rhythm Beethoven uses here is:

|___|___|___|
|________|__|

You can see how the notes are staggered.

Answer 3

First of all, this has nothing to do with "solfege".

Secondly, Clair de Lune is composed by Debussy and isn't played (or named) "Adagio sostenuto". This is a bar from Beethoven's Sonata #14, usually just called Moonlight Sonata (this shows it in d minor instead of 'c# minor` which is the original key).

Regarding the music: the passage is mostly fine. It's not what was originally written, but the result would be close. What may be throwing you off is that if this passage were really written with the last quarter note (crotchet) on beat 4 the preceding half note (minim) would either have a quarter beat (crotchet) rest after it or it would have a dot added so it was 3 beats.

The top two voices are correct. The bottom voice should be a whole note (I guess what you would call a "semibreve").

Check the links and compare. Good luck!