Tools> Transpose> Same octave. Something I do not understand

Hi,
It seems to me that when using Tools> Transpose> Octave down> Same octave
transposed notes should remain in place while sounding an octave lower. Is the "same octave" should not mean that? What happens when using this command is that N/3/4 written notes one octave lower. I do not understand.
It seems to me that when using Tools> Transpose> Octave down> Same octave
transposed notes should remain in place while sounding an octave lower. Is the "same octave" should not mean that? What happens when using this command is that N/3/4 written notes one octave lower. I do not understand.