IPN overwrite issue

1) I’m seeing a lot of successful paypal payments in my woocommerce orders (woocommerce is fully up to date)

2) In paypal IPN history I’m seeing a good number of retry IPNs

3) within those the notifyurl is readon “0” when it should read http://mysite.com/?wc-api=WC_Gateway_Paypal.

Can anyone tell me where this notifyurl message is being overwritten and how to update it?

https://wordpress.org/plugins/woocommerce-gateway-paypal-express-checkout/