Hi Trevor.
I am Dave, an Independent Advisor, I will help you with this.
The Storage page in the Settings App has a known bug, where it does not correctly report the space used on your hard drive by the various categories.
Click the link below to download a small free utility called Treesize. Using that tool, you will instantly see where this space is being used.
https://www.jam-software.com/treesize_free/
To run TreeSize, right click its icon and choose Run as Administrator.
Please provide a screenshot of your C drive in that TreeSize utility, so I can see your hard drive and work out where that space is being used and if there is an underlying problem.
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