Hello,
When did you download the theme archive? Did you install a child theme when importing demo content? An archive with a bug was available for download during a short period of time and it seems you used that one. With the current archive, which is available on Theme Forest, all should be fine.
Please, read the refund policy – https://themeforest.net/page/customer_refund_policy
, refund request can be submitted here – https://themeforest.net/refund_requests/new
Regards