There seems to be something that is stopping the body font to be updated. Here are some things you can try:
#1 Disable your cache plugin and see if the body font gets updated.
#2 Update X and Cornerstone to the latest version. Here is a link for details information on how to do an update:
Please remember to clear all caches when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors or any unexpected display issue on the site.
#3 Instead of using a Raw Content element for the texts, try adding a Text element to the builder and move the text from there. That way, you will be able to select the font that will be used to the text in the settings available. In case you are not seeing the options to set the font family of the text, please check your preferences settings and enable the Advanced Mode feature. Please click on the cog icon on the settings area then enable the Advanced Mode option.
Hope this helps.