The change in font when adding bullets to text can occur due to several reasons, and it often depends on the software or text editor you are using. Here are a few common explanations for this issue:

Default Bullets Style:

Some text editors or word processing software have default styles for bulleted lists. When you apply bullets to a paragraph, the software may automatically adjust the font, size, or other formatting settings to match the default style for bulleted lists.
List Styles:

The software may apply a specific list style to bulleted text. List styles often include predefined formatting settings, including font styles. Check if your software allows you to customize list styles to maintain consistency with your preferred font.
Formatting Inheritance:

In some cases, the formatting of bulleted text can be influenced by the formatting of the text that precedes it. If there's a change in the font of the preceding text, it may affect the font of the bulleted text as well.
Templates or Stylesheets:

If you are working with templates or stylesheets, they can define specific formatting for different elements, including bulleted lists. Ensure that the styles defined in your template match your desired font settings.
Copy-Pasting from External Sources:

If you are copying and pasting text from external sources, the formatting may carry over. The source text may have different font settings, and pasting it into your document could bring those settings along with the text.
To address this issue, consider the following steps:

Check the formatting options in your text editor or word processing software to customize the style of bulleted lists.
Ensure that your document or template styles are consistent with your preferred font settings.
If you are copying text from another source, paste it as plain text to avoid carrying over unwanted formatting.
If the issue persists and you provide more details about the software you're using, I can offer more specific guidance.