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Creating Blog Landing Pages and filtering blog posts

Hi everyone! I’m currently trying to create a bunch of blog landing pages. The blog will have a separate landing page for each category. I have this set up as its own collection (Blog Landing Pages). Those landing pages will then feature articles from a separate collection (Blog Posts).

I’ve created a multi-reference field to help filter between which blog posts belong on which landing page. The issue I’m running into is within my (Blog Landing Page) template whenever I add filters to one landing page, it is automatically updated on the others. Am I missing something, or should my landing page not be a collection?

Here is my public share link: LINK
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