There is an active ticket to resolve the retroactive Trophy notifications hiccup.
And now you're asking, what is this whole 'Trophy' thing all about... In basic form it is a peculiar gamification of the site owners to encourage Members to participate.
The awards and very customizable and actuating the trigger points can be quite silly if keying in on certain milestones accomplished by forum Members. Especially the one that could be issued for being banned from the site.
This sudden resurgence of the trophy points should only happen once until you hit the next milestone. Hopefully by then the ticket will have been resolved and will fire as intended.