Hi - I tried using 'number-sections: true' with PDF output (knitr, through RStudio) - somehow the titles are changed then.

This code produces the result as expected (with the correct title): 

```
---
title: "The Association of ..."
author: "Me, someone else, anyone else"
toc: true
number-sections: false
format: pdf
---

# Abstract

# Background

Quarto enables you to weave together content and executable code into a finished document. To learn more about Quarto see <https://quarto.org>.

# Methods

asdfasdfasdf
```

but changing to `number-sections: true` yields this: 

![Screenshot 2022-03-16 at 15 22 33](https://user-images.githubusercontent.com/24943957/158611756-fa031602-dbc8-474b-ad02-5bca97ec4dd0.png)

Am I doing something wrong (YAML intendation or similar)? Thanks  for any inputs!

edit: interestingly, with format: docx and a reference-doc supplied, numbering works as expected

Info: 
quarto 0.9.105
R version 4.1.3 (2022-03-10)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Monterey 12.3
R Studio Desktop IDE: "2022.02.0+443"
2022-03-16T14:25:31Z
cathblatter
closed
Option 'number-sections: true' leads to wrong title in PDF-format
https://github.com/quarto-dev/quarto-cli/issues/425