Something wrong with notifications?

I have lately been receiving multiple notifications for the same topics even when nothing new has been posted or edited in them. Is this a bug that has been introduced recently?

I had that the other day for an hour or so, but it appears to have stopped.

I am still repeatedly getting notified on two topics without any apparent activity. I am still the last poster on both of them...

I'm now seeing this again with this thread - How to restore a seach

Ping @discourse

I am still seeing it on this thread: Mark IP Value with an external list

I have previously also seen it for this thread, but did not yet have any notification for it this morning: Error loading configuration after upgrading to 5.0.1

The notification, showing it was today, just a minute ago;

The OP;

Also happening for this thread Logstash cannot find mongodb output plugin

Another one for the immediately above thread