wrong calculation

I am real estate brocker and use the real BA II Plus for my work. I payd your application because , I thought that having only the IPhone with me is much easier.
With my BA II Plus to calculate a mortgage (P/Y=12, and C/Y=2) : 200000+_ PV, 0 FV, 300 N, and 3.59 I/Y, the corect calculation give= 1010.92 $/month.
Your aplication with the same seting (P/Y=12, and C/Y=2) and 200000+- PV, 0 FV, 300 N, 3.59 I/Y, CPT - PMT
= is giving 3607.35$/month ??????

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