Hi,
Thanks for using our plugin and reaching out to us. Sorry to hear you are experiencing issues with duplicates in your feed. This usually happens when the plugin is running into server configuration limitations. You might be able to verify this is happening by checking your WooCommerce fatal error logs for execution time, CPU or memory errors. This is where you can find those logs: https://woo.com/document/finding-php-error-logs/
Can you try lowering the batch size of the plugin from the default 750 products per batch to a much lower number, lets say 250, so it uses less server resources? This is how you can do so: https://adtribes.io/batch-size-configuration-product-feed/
Hope this helps.
