Either, the address of private key 3 is
1CUNEBjYrCn2y1SdiUMohaKUi4wpP326Lb
or it's
1NZUP3JAc9JkmbvmoTv7nVgZGtyJjirKV1
There cannot be two addresses!
Do you ever heard of compressed/ uncompressed addresses???
Pleased read this:
https://en.bitcoin.it/wiki/Address