Design issue Alerts showing for deleted threads?

[Russ]

I signed on this morning to find out I had 3 alerts(assuming they're from that nice little spam topic we did to see if having tons of thanks would slow down the page.

I clicked on the alerts dropdown, and it showed I had none. I presume it's from the deleted thread, is there a way of fixing at all? Or is this even a bug?

 

[Mike]

It's really not feasible to prevent it from happening, especially if the content is only soft deleted and can be brought back.