Thank you for credentials but the dev site requires authentication (see screenshot below).
This bug has been resolved from Pro 2.1.0, X 6.1.0, Cornerstone 3.1.0, I was actually able to test this just now as one of my old dev site (Pro 2.0.1) has this italic issue. I have updated that dev site to the latest version (Pro 2.2.4) and the issue has been fixed.
If you still experience the issue after the update, please navigate to Theme Options > Typography toggle the BODY FONT ITALIC to ON then save. Then toggle it back to OFF then save again.
Remember to clear all caches (plugin, server-side, CDN, and browser's cache) after updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
Hope it helps,