Often, when you create a guide, you copy text from another source (a website, Word document, or something else).
If you select text and copy/paste it into your guide, the formatting of the original will carry over into your Libguide.
This is not what you want, since it will override the styles of our guides.
An easy way to solve this is to use the Remove Format button.
After you paste formatted text into your guide, highlight that text and click the button that looks like a T with a small x next to it. This will remove the formatting so that our stylesheets will take over, allowing your text to appear in the correct style.