strange result in recording

mac book pro with mavericks
audio card steinberg ur824
cubase pro 8.0.5

i created 6 new audio tracks I called ’ a b c d e f ’
put the tracks a,b,c, in folder 1
put tracks d,e,f in folder 2
now I choose the input
trk ‘a’ input 1
trk ‘b’ input 2
trk ‘c’ input 3
trk ‘D’ input 1
trk ‘e’ input 2
trk ‘f’ input 3
now i put in recording only the trk a, b, c in folder 1
finished the recording i find recording in all the audio tracks a,b,c,d,e,f
even if d,e,f were not authorised to register

Is this normal?

ciao