I've never seen that either. It appears to be rounding. The re-fi costs were $2,096 amortized over 5 years at $419/year. This is the fifth year and there is a remaining balance of $1. It appears that amortization was $419.20/year. 

So it appears the $1 rounding is due to the .20/year amortization not recognized. You would think the program would automatically adjust that to $420 final year amortization.

Thanks.