There are several lines between line 11b and line 16.
For example did you have a Child tax credit on line 13 that they denied?
Did you have other taxes such as the SE tax of self-employed on line 15 from Schedule 2 (there could be several other things on Schedule 2) that you did not report.
All these things will change what is on line 16.
Without more information, nobody here can know what or way the IRS changed.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
