This can occur when the HTML is retaining previous information. If the content has been edited multiple times, additional HTML tags can accumulate; which causes unwanted rendering. 

You can utilize the HTML Clean Up tool within the editor:
  1. Navigate to Content > Standalone Webpages
  2. Hover over the name of your webpage and click Edit Webpage
  3. Click Paintbrush image for the Clean Up HTML > Clean Up <Font> tags
  4. Click the red "X" to exit the page
  5. Click Save on the Standalone Webpage
  6. If you working within an initiative, navigate back the Webinfo Checklist and click Publish This Event Now

If the content still appears different, repeat the steps above, altering step 3 to click Clean Up <Span> tags. 

If this issue does not resolve, Chat with Support and reference this article.