Hmm, the most likely cause is a copy/paste from another tool, e.g. your text editor (MS-Word, Apple Pages, etc.) or from your email client (Gmail, Outlook, etc.) or from another website. Typically, when you do the above, it brings over not just the content/text, but also the formatting/styling.
Here are two options for getting around it:
- When pasting into the Text/Body section in a new TR webform, use Ctrl+Shift+V (or Cmd+Shift+V on Mac) to paste the value/text only.
- Paste it into an "ancient" text editor first (e.g. Notepad on Windows), then copy the text from there (Ctrl+C or Cmd+C), then paste into the TR Text/Body section.
This will ensure the formatting is nice and uniform throughout the site.
Your readers thank you : )