Thanks for writing in!
This could just be a caching issue. Please log out of your WordPress dashboard. Clear all your cache and your browser cache as well. Login again and test Cornerstone.
SiteGround has a caching feature as well. Please clear your site cache or temporarily disable the supercacher in your hosting panel. The SuperCacher is developed by SiteGround exclusively for their customers. It increases the number of hits a site can handle and boosts the website loading speed. The SuperCacher includes 4 different caching options for maximum optimization of your websites. You can access the tool by clicking on the SuperCacher icon in your cPanel.
For more information about this, please check it out here: https://www.siteground.com/tutorials/supercacher/supercacher_intro.htm
Hope this helps.