That's why I think you have the same problem that I did.
I had an update that would fire off every time I shut down my pc. The update was applied properly, but it never flagged itself as completed so it kept showing up as something to be done. It was very annoying!
That's why you should take a look at the name of the update, and see if it's the same one every day.
If so, there's a fairly simple fix.