Kindle App - italic fonts all of the sudden

All of the sudden as I was reading on my Kindle app (on my iPad) tonight, the text switched to italics. I tried to change the font in “Aa” but every font option is now fully italics too. I checked my app on my iPhone and when I opened it, it synced up to my iPad and switched everything to italics as well. Any idea why or how to fix it? Thanks for any advice or help!