If you have two mortgages you will get two 1098's. You should post both of them independently.
If you've refinanced or had your mortgage lender changed on one of them you need to enter both 1098's (same property).
Change the line 2 of the mortgage that you no longer owe on (like the one that you refinanced and paid off) to a 0 (zero) because you have refinanced out of that loan and no longer have an "outstanding mortgage principal".
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