Messenger

[Downpatrick]

Deleted messages keep reappearing on fb messenger 

[MI5]

@Downpatrick 

You could try deleting and reinstalling the app, other than that, contact FB to report it.

[Downpatrick]

I have done all that mo joy

[Oxonian]

@Downpatrick 

This is a known and longstanding problem. If you Google for "Deleted messages keep reappearing on fb messenger" you will get lots of hits, including this from The Verge that dates from 2018 :-

Facebook confirms years-old messages are randomly coming back to haunt users - The Verge

https://www.theverge.com/2018/11/26/18113539/facebook-messenger-old-threads-conversations-resurfacin...

There are some suggestions as to how to deal with this ; you would need to read a few or the articles to try to ascertain what might work for you. 

[madasaf1sh]

@Downpatrick 

Remove the use FB Messenger as an SMS client and stop the syncing of SMS to FB Messenger

Have a look here: https://www.facebook.com/help/442105343709195/

Other than that try reddit, to see if anyone else has had the issue..

[MI5]

@Downpatrick 

I'm sure FB are fully aware so yet another app update is probably required.