Hello,
First of all thanks for choosing our Theme, we are glad to be you in the WoodMart WordPress family 🙂
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 server providers and ask to increase this limit. Recommended value for this is 5000.
If PHP max input is ok, however, you still have the problem, deactivate all the plugins not related to the theme, switch to the parent theme, if you use the child and provide admin panel login details of the website to check it myself and help you out accordingly.
Best Regards.