Hello, Siv,
We understand that you are experiencing an issue with the font family of your buttons. We have determined that this issue is caused by the use of custom CSS code that overrides the options values set in the theme.
Please refer to the following screenshot for an example: https://postimg.cc/qhFdPVDT
As you can see in the screenshot, when we remove the custom CSS code, the issue is resolved. The screenshot is available here: https://postimg.cc/N28p1RHz
To resolve this issue, we recommend that you locate and remove the custom CSS code that is causing the problem. You can find this code in XStore >> Theme Settings >> Theme Custom CSS.
We apologize for any inconvenience this may have caused and we hope this solution resolves your issue.
Kind Regards,
8Themes Team.