Brotli compression not working even though enabled at server level on openlitespeed

Brotli compression is enabled at server level on openlitespeed, but HTML being compressed as GZIP

Website: https://www.espressoschool.com.au

Request header
accept-encoding: gzip, deflate, br

Response header
content-encoding: gzip

All other static assets on CDN are already being compressed by brotli