Raw responses are little more than simple DOM. Did you mean that there is a JavaScript which dynamically manipulates your DOM on the fly and you don't get those in responses from server ?
Did you check raw response logs or generation logs for HTTP / Web ? You should see those contents in response logs as well. Record your script and run with full extended logs and see what you get in responses or look in generation log responses where you want to find string contents. Sometimes it might be in redirected requests so please look at complete request flow instead of just one originating request.
Thanks!
