This seems like a theme issue. I believe it’s trying to pull the site title or site description and append it after the hyphen. You can also see this issue occur if you hover your browser tabs title or view source and view the title tag. To test this theory you can follow the below instructions:
1) Log into WordPress
2) Use the left-hand navigation and click on Settings
3) Add text to both the Site Title and Tagline fields
4) Click the Save Changes button at the bottom of this page
Additionally, you can install Yoast to better manage these on a per page basis.