The order of child pages show in the API does not match the order show in the Confluence UI.

Steps to Reproduce

Create a page, and under it, create a series of child pages with names starting with different characters. You will see that in the Confluence UI they are ordered alphabetically.
Next, load the child pages API for that parent page. If the parent page you created has the ID 5308424, then the URL would be /rest/api/content/5308424/child?expand=page.title

Expected Behaviour

The order of pages matches the UI

Behaviour Experienced

You will see that the order of the pages does not match the UI and that the "extensions" -> "position" property is "none".