Hi, JC!
If you are in the middle of the flow and apply some changes, it will continue sending the old messages/steps until you finish the automation. Next time you trigger it, the new flow will be delivered.
If this isn't your case, try duplicating your automation and setting another trigger to it. Test if it works this way. Afterwards you can change the keywords to the ones you are using (but remember to deactivate or delete the old triggers. If you have more than one automation with the same triggers, strange things start to happen
)
Thanks for the reply, I will try it out. The things that I have done are,
- Delete the automation.
- Disconnect from FB and connect.
- Created new flow and publish
but these old messages keep popping up, is it because Halloween is coming, just joking 
Thanks for the reply, I will try it out. The things that I have done are,
- Delete the automation.
- Disconnect from FB and connect.
- Created new flow and publish
but these old messages keep popping up, is it because Halloween is coming, just joking 

This is VERY strange… what you did should have solved the issue.
I'd recommend you open a ticket at https://help.manychat.com/. The support team may be able to help you with that.
Yes, it is really strange, the old flow is haunting me, even if it is delete and new one is publish. Thanks for the link
Now I know what happened when I checked, the automation was loaded on my template which is still installed and active, so I uninstall and delete the template. Now it is loading the new flow. Thank you.