Hello @farkas1803,
First of all we would like to apologize for all the trouble you are having.
When we locally checked the theme we are unable to find such issue.
So we could not suggests anything for now since we don’t know what exactly is going on so please once check the error by setting define(‘WP_DEBUG’, true); in your wp-config.php. file. This will list the error and please post your issue here so that we can help your further.
Thank you.
Best Regards!!