Pages not resolving – Shows what looks like sitemap

We have been using WP Fastest Cache for a couple months now and there seems to be a very annoying issue the comes up everyday. Some pages show up looking like a sitemap instead of the page content. To resolve this we go in and clear all the cache and pages seem to work fine for about a day and back to the sitemap look.

If we disable this plugin the site runs without any problems.

We initially installed this plugin to gain more speed in page loads, but with this issue we are forced to disable the plugin as nothing we have tried has fixed this problem.

The current version of WP Fastest Cache we are running is 0.8.7.6.

Any suggestions?