Vocal recording problem?

Someone recorded some vocal tracks for me. I have attached the lead, and one of the background tracks (both  done by the same singer).

If I listen to these INDIVIDUAL vocal tracks they seem to be phasey? Sometimes even sounding robotic? These tracks were not processes according to the singer. Could this be a recording issue? Or anything else.

If I put all vocal tracks together in the mix it sounds not good at all. (I attached the mix also)

Any insight in this problem is really appreciated. Thanks,

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I have fixed the original post audio now.
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I real like the frist one 
try eqing and focus on the main sound your trying to bring out