Mortgage 1098 Taxes Owed Increasing

I refi'd this year.  I have 2 -1098's.  When I enter the 1st form, my taxes owed DECREASE.  When I enter the 2nd form my taxes owed INCREASE.  Any idea why that is?  I assumed that the Interest paid for the original and refi'd loan should add together and it should reduce the taxes I owe.  What am I missing?