Hello,
Thank you very much for choosing our theme and for contacting us.
In most cases, this issue may be connected to the PHP max input vars limit parameter in your web server configuration. You can check the current value for this parameter in your Dashboard -> WooCommerce -> System status. Usually, this parameter is not allowed to be changed on shared hostings so you will need to contact your host providers and ask to increase this limit. The recommended value for this is 5000.
Also please make sure mod_security
has been disabled. Please contact us if the problem presists.
Best Regards