Hi Kelly,
The updates are usually installed once on the PC except for the updates that come with a feature change.
If you want to check if your PC installed a duplicate update, go to the update history and follow the steps below:
Go to Settings - Update & Security - Windows Update - View update history.
Update history allows you to find all the updates installed on the PC (Feature updates, Quality updates, definition updates, driver updates etc.)
Thanks,
Andrew N.