Hello, Kevin,
Thank you for getting in touch with us.
Try to change the Quantity Type via Theme options > WooCommerce > Shop elements > Quantity and test how it works then.
Let us know the results.
Also, provide URL of the mentioned product, temporary wp-admin, and FTP access, so we can take a closer look at the situation on your site.
To provide wp-admin access, you can create a new user account with administrator role via the Dashboard, and provide us with the username and password via the Private Content area.
To create FTP access, please contact your hosting provider for assistance.
Kind Regards,
8theme team