Windows installed a cumulative update preview that was from November. Why would this happen?

[Windows 10]

I turn my computer on and it shows an update notification. Checking in the settings, I see that an update preview from November has to be installed. It's December, so it seems a bit weird. Plus, I already have November's and December's updates installled. Later, I restarted my PC without- I believe- using the "update and restart" button, but the update was installed nontheless. I am wondering if I should be worried. I have done AV scans, and nothing was found.

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