Regrading the same issue i already contacted the woocommerce support team via chat and they also confirmed that the issue due to with plugin bug. And that bug are already reported with the your plugin developers and also he send internal note also. The woocommerce support person comment is following
This is because WooCommerce core NEVER submits the form. They listen for a submit, intercept, and then always return false. Everything for submitting an order happens in AJAX calls during that intercep, during the checkout processt.
It’s in: if ( $form.triggerHandler( ‘checkout_place_order_’ + wc_checkout_form.get_payment_method() ) { // keep processing checkout }
So the issue with plugin and please resolve the issue ASAP
Thanks,