Cache control

Hi Alex.
My site is hosted at Siteground and I cannot use their “Dynamic Cache” (which will improve site performance) because one of the plugins installed is adding the following headers to the page:

cache-control: no-store, no-cache, must-revalidate
pragma: no-cache

I disabled the following plugins (armember, lenix-elementor-leads-addon, updraftplus, relevanssi, seo-by-rank-math) to test whether they were preventing caching, and it had no impact.

When I disabled Quiz Tool, the caching was restored. Can you please look into it and see whether this makes sense, or whether this is something that can be solved in Quiz Tool? I suspect this may also be the culprit interfering with the armember plugin.
Please let me know.
Kind regards,
Humberto