First things first - the editor isn't possessed or crazy. And, there's usually a simple fix for this.
Rogue formatting usually happens when you've pasted in content from a source other than a simple text editor. A simple text editor is Notepad for PCs or TextWrangler for Macs. Sources that aren't can be webpages, older campaigns (still webpages), emails, excel, word, etc...
To remove any rogue formatting so you can set the formatting you want, you'll want to use the eraser tool to remove the old formatting.
To do so:
- On the Design step of the Campaign Builder, click in any area, or click the edit button, to bring up the editing window and toolbar.

- Highlight the text you want to change (if you need to remove all formatting, use CTRL-A to select all, which will grab even stuff you can't see in the background).

- Click on the eraser button on the toolbar. This will only remove the formatting, not the text itself.

- Then you can highlight the text you want to format again (if needed) and set the correct formatting on the text.
Note
If you copied in your content from Word - there's unfortunately a more involved process to fix this: How do I clean up my campaign if I originally used Word?
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