Hi,

The problem might be with your 2.1. Objective heading.

Try deleting this heading completely then add a new 2.1. Objective heading using a heading 2 style.

If that does not work, try deleting 1.1.3. abc completely then add a new 1.1.3. abc heading using a heading 3 style.

There are a few other things you could try, one of them is importing heading styles from another document which has headings that are numbered correctly and the other is to create a new heading list.

Hope this helps.