Inconsistent application of the cache

I am having some issue where the plugin will not engage and things that would normally be covered by lightspeed cache plugin are not. I’m not sure if this is something to do with the plugin or something on the server side.

See below tests i have run with no changes to any of the lightspeed settings:

Good Scores
https://pagespeed.web.dev/analysis/https-chichesterdental-co-uk/8mcvdxqa2l?form_factor=mobile
95 (Mobile) / 100 (Desktop)
https://pagespeed.web.dev/analysis/https-chichesterdental-co-uk/6g4ag905cc?form_factor=desktop
95 (Mobile) / 100 (Desktop)

Problem Scores:
https://pagespeed.web.dev/analysis/https-chichesterdental-co-uk/5g7qcpstvl?form_factor=mobile
53 (Mobile) / 94 (Desktop)
https://pagespeed.web.dev/analysis/https-chichesterdental-co-uk/l5onx1zd8n?form_factor=mobile
54 (Mobile) / 100 (Desktop)

Ive sent a report to Litespeed to and the report number is: LAQHQLFZ

The page I need help with: [log in to see the link]