What URL/channel are you using? Are you embedding on your own website, or using an app, or using botlibre.com?
What web browser are you using?
I don't see how this is possible, as sending a chat message is done in JavaScript, and does not refresh the page. My guess is you have JavaScript disabled in your browser, or some error is occurring so none of the scripts are running, and you get the input's default submit.
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