Annoying Facebook messenger notification

[Bananarama101]

Minor in the grand scheme of things, but it's annoying me frankly!

When on Facebook mobile it's saying I have a messenger notification:

Have you checked your messages spam folder?

I get this and is annoys me so much!!

Sorry, posted too soon...

When I click it takes me into Messenger, but no message. Not even in the 'Message requests' but from people not FB 'friends' with.

Any ideas how to get rid of this petty annoyance?

Yep I get this all the time or I'll read my notifications on FB but they don't go away. Sometimes I log out or delete and reinstall the app both of which solve it

Do you use marketplace? Last time this happened it was a random message in my marketplace folder

I have to switch off.