No, I'm not sure. While that could be the situation, the program calculated the tax amount incorrectly on the original return. I didn't check it before I filed it because I trust the software to calculate the tax correctly. After I received the message that the amounts had changed I manually checked the tax calculation and it was wrong on the original return. After it was efiled it showed the correct tax. Fortunately the change was in the client's favor. But it's embarrassing and unsettling that the software didn't do it right initially.