In the past, I have done a 'clean install' of the ASB which has served to clear up oddities.
To see if that resolves your issue.
Clean install of the Secure Browser: Thx Bob
Download the installer from here,
https://www.avast.com/en-us/secure-browserDownload the Secure Browser Removal tool from here,
https://download.avastbrowser.com/avast_secure_browser_uninstall.exeSave your Bookmarks via the Book Marks Manager if you have custom bookmarks so you can import them when you re-install.
Uninstall Secure Browser via Programs and Features - Reboot
Run the removal tool, reboot, run the installer import your favorites if you saved them.
A video to help with the installation:
https://youtu.be/r_VLA0HMLQMReport back if that's solved the problem or not.