I have a refinance in the area of $400K --- my mortgage has never exceeded the point at which interest is disallowed. I paid almost $10K in mortgage interest, but I saw that some worksheet was showing the allowable interest as only something like $11. I found something dating back TWO YEARS saying there was a bug where somehow the current balance and the original amount were being added together, resulting in the software thinking the total was too high, and the user should manually edit to remove one. I had to actively change that and to override the box talking about how the refi had been used ... and then the computation turned to $20. I overrode it to put in the full amount of mortgage interest, but I clearly shouldn't have to. What's going on?
