One of the 3 dropdown menus down the posts can be set to show post from the last 100 days, from the last year, from the beginning and so on. I see those dropdown tabs on your second picture. The left menu shows 100 and I guess it tells you in your language to show the latest 100 posts
I'm not sure if you can disable this in admin, I don't have a similar forum by hand for checking...
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