Notes · Step 4
Same note, many places
Play a C, then the C eight white keys up. They are different heights and yet plainly the same note: that distance is an octave, and it is where the letters start again. A keyboard is a straight line, so each note has exactly one place per octave and the pattern simply repeats from left to right.
A fingerboard is a grid. Its strings overlap in range, so the same pitch sits on several strings at once — on a guitar, the fifth fret of one string is usually the note of the next open string. None of those places is wrong; players choose between them by where the hand already is.
The drill counts every one of them as right, and shows them all when you miss.