External mixer has no effect when recording

I am fairly new to this i will say first of all. But when i try and record a mix when i use any of the buttons on my external mixer, even the Cross fader, it has not effect on the recording mix.
So for example im playing 2 tracks and the Cross fader on the external mixer is in the middle. Out of the speakers is both tracks playing nicely, but when i pull the Cross fader to the right say, on my speakers i will just hear the track on the right like i am meant to but when i play the mix back the other track is still there even tho the Cross fader is set to the other track. So i can play both tunes and go between channel 1 n channel 2 with the Cross fader and it will make no difference in the mix.
Can anyone help
So for example im playing 2 tracks and the Cross fader on the external mixer is in the middle. Out of the speakers is both tracks playing nicely, but when i pull the Cross fader to the right say, on my speakers i will just hear the track on the right like i am meant to but when i play the mix back the other track is still there even tho the Cross fader is set to the other track. So i can play both tunes and go between channel 1 n channel 2 with the Cross fader and it will make no difference in the mix.
Can anyone help