Thank you for bringing this to our attention. Are you having this same experience in more than one email campaign? Or more than one block? A good troubleshooting step I would suggest is testing your campaign in a different browser or a private/incognito window. Doing this allows us to see if these formatting changes is browser or campaign related. If you are copying and pasting any text in your campaign from an outside source it's also important to make sure you've removed any problematic formatting that may cause issues in your email template. Do either of these steps help?