Molding problem

I made a positive and negative mold of a person/sculpture to use for foam latex appliances. I wanted an extra copy of the positive, so I molded it in alginate and cast it in ultracal (Which I did for the original positive and negative). Problem is, the new positive somehow doesn't fit right in the negative and I can't figure out why. It should fit perfectly, shouldn't it? What could I be doing wrong?
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