Step to reproduce

1. Create a page in your Confluence and add Headings.
2. Add Table of Contents macro
3. Set the space's theme as the Documentation Theme
4. Click on the links on the Table of Contents

Expected Behaviour.

The page jumps to the content

Actual Behaviour.

The URL changed but the page didn't jump to the content.

Workaround

Change the theme to Global Look and Feel theme.