If it is related to cloudflare, I don't recommend adding that second page rule mentioned on the linked thread that says:
Quote:
*.youdomain.com/*
Then the settings are: ssl: off, browser cache ttl:1day,always online: on, cache level: cache everything
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When I added this rule for my forum, the threads were not getting updated instantly and members were complaining, saying they were only able to see posts from 1 day ago and earlier. That was because cloudflare was serving them cached threads.
Maybe it is causing similar issues on your forum. Make sure whether you are able to edit older VMs.