If you have any other bots on Messenger connected to your page, you need to remove them in order for Octane AI to work properly.
Here is how to check whether you have other bots connected to your page and remove them:
1) Go to your Facebook page and hit "Settings" on the top right:
2) Go to "Messenger Platform"
3) Scroll down to "Subscribed Apps" - if you see anything other than Octane AI, simply hit "Remove admin" or "Uninstall"