[Nyx]

What do you mean by echo? Do you mean double posting? It's most likely a connection issue on your part. Double posting tends to happen when you click on "Post Reply" and you experience lag so you click again, thinking your post isn't going through. Or maybe you double-click on "Post Reply" and your phone lags between the clicks. Or maybe you reloaded (either by clicking refresh or going back from a later page onto the reply page) the "reply posted" page.

Whichever of these cases happened, the forum server interpreted the action as you posting a separate reply. To fix it, just click once and then wait out the load, or don't click the Back button if you've recently posted a reply.