issue export mpc studio

hello to all.
I encountered a problem when exporting individual tracks.
When I export the sequence of the beat alone does not feel the wave file exported kik the beat while the snare hit hat so it feels.
Can anyone tell me where is the problem?
I noticed one other thing, when in fact I'm going to export the entire song instead you can hear everything perfectly.
It 'a very strange thing but I'm losing my mind and I am not in charge.
Please be so kind as to help me solve this problem thanks
sorry for my bad English but I am Italian.

i'm not sure if i understand this question correctly but i think i might be dealing with the same issue by what I read