When changing a header level, the above headers don't always update

Start with this document

```
= Working with PostGIS

== Importing and Managing Spatial Data in PostGIS

== Indexes on Spatial Data

== Spatial Analysis and Operations

=== Spatial Joins

=== Spatial Aggregations
```

Remove one header character on "== Indexes on Spatial Data" and see that the word count on "Working with PostGIS" header above it doesn't change.