WordPress Speed Up Service | WordPress Website Maintenance Packages Reply To: RSS feed does not validate., by Samuel Wood (Otto) The problem is that you still appear to have everything enabled. Looking at the source of your site: view-source:https://flashtechloud.com/ I still see you running the viral theme, and several plugins enabled. The problem is going to exist until you work out which plugin is doing the wrong things here. I may be seeing a cached version, in which case, turn W3 Total Cache back on and clear the cache. Reply To: RSS feed does not validate.