When I click the arrow to sort alphabetically, the first company for the z-a sorting is ANZ. Was wondering if it has to do with the all-caps name, but it seems like other all-caps company names are sorted alphabetically in the a-z sort.
https://wikirate.org/Climate_Action_Research+TCFD_Supporter
Turns out the letters in the company name were not latin (ANZ) but Greek (Alpha Nu Zeta). Renaming fixed the problem.