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Unfortunately, this issue is known limitation of this type of filter. To sum it up, only the items displayed on your current page are filtered. Currently, you’re probably displaying only 10 or 12 posts per page and it’s only filtering those. You can either choose to expand the list to 24 or 30 posts per page or install Jetpack (https://wordpress.org/plugins/jetpack/) and activate its Infinite Scroll feature. This will load posts as long as you scroll down your page and when clicking the buttons, a bigger list of posts will be filtered as more posts per page are displayed.
Obviously, there is better way to solve this issue and I would recommend using some thing similar to Facet WP (https://facetwp.com/). However, I have to mention that implementing these kind of solutions require some coding, an extra paid plugin or sometimes both.