Collection Filter Tag List Issue

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I am having an issue with the tag list in my collections sidebar. I have it working to filter my product via tags and have my products tagged appropriately. Once I uncheck a tag to undo the filtering, the collection proceeds to show every product, not just products in that specific collection. I need to know how to adjust the code so that when I uncheck my filter, only the products that were originally showing when the page loaded return to the screen and not every product on my site.