I took a look at the UI widget you’re using - it is using Rasa’s REST API. This means, that it will use an HTTP Post operation to send the user message to the chatbot - and takes a fully compiled list of all the chatbot responses with it. There’s no way for the chatbot to “report back” by itself once a single response is ready.
You can fix this by using Rasa’s WebSocket API instead - unfortunetly, @JiteshGaikwad 's UI widget doesn’t support this. You can use Botfront’s Rasa-Webchat instead.