What is FTP password? You mixed a few questions in 1 topic, which may cause a mess in conversation. At first sight, all problems are caused by using 3rd party plugins and caching. Disable such plugins, clear or temporarily disable CDN cache and check the single product page. Also, we would recommend you update the theme and Core plugin – https://xstore.helpscoutdocs.com/article/37-plugins-update https://xstore.helpscoutdocs.com/article/63-theme-update
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