Apologies for the inconvenience caused. I’ve tested the Button Group addon using the latest version of SP Page Builder Pro, and it appears to be working correctly on our end.
To help identify what might be causing the issue on your site, could you please share your Joomla administrator access credentials? Before doing so, we strongly recommend taking a full backup of your website to ensure everything is safe.
I’ll be happy to investigate further and provide a solution as soon as possible. Looking forward to your response.
Best regards