You select some characters, make them bold and suddenly your entire document is bold?

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

Read more Show archive.org snapshot

Here's how to fix that:

• Right-click the style in the "Styles and Formatting" window
• Select "Modify"
• Go to the "Organizer" tab
• Unselect "AutoUpdate"

You're welcome.