All Fonts Changes To Italics!

I’ve been working on a site https://spiritualfitnessprogram.com and just recently added a plugin called “Styles with Shortcodes”. Once I activated the plugin the Themes body text was switched to italics. I turned off the plugin in hope of the body text returning to normal and no change. I then turned all the plugins off and still no change. I then switched the theme to 2012 to see if it would have the same italics issue, but it didn’t. So I removed the theme I was originally using (AVADA) and re-uploaded it and I still have the italic body text. There has to be a simple fix here, any help would be appreciated.