"Most recently updated" sort

Results sorted by "Most recently updated" seem to be inconsistent.

The first items are different depending on environments: 
- https://wai-website.netlify.app/test-evaluate/tools/list/
- https://www.w3.org/WAI/test-evaluate/tools/list/

Results do not appear to be correctly sorted: some items updated in February 2024 are listed after items updated in December 2023.