I have just noticed this today that Start8 displays my "Startup" folder as "Start-up".
But if I browse to:
C:\Users\[Username]\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\
or
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\
the folder is "Startup", which is correct.
I haven't noticed any issues with the programs in my "Startup" folder though.