Plugin does not work, caching plugin purged and deleted

Hey, cannot get your plugin (or any similar for the sake of argument) to get to work on my website. Weirdly it only works with ‘Contact Us’ section of the website with a form.

What I have tried so far:

1. Purged all cache with LiteSpeed Cache plugin number of times.
2. Disabling that plugin after purge.
3. Deleting that plugin completely
4. logging out and back into backend.
5. updated all the themes and plugins to latest versions

Yet neither of those and combination of those methods has had any impact. The maintenance plugins just don’t work and I have no idea what to do next. Surely, caching plugins should not be this stubborn.

Cheers
Six