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That's just how it works.

You click any link at the bottom of a page, when the link loads you will be at the top of the next page.

If a change of behaviour is desired, then a suggestion would need to be posted.

In fact, some suggestions exist already related to this. You posted one, but it was a duplicate so I merged it with the original:

https://xenforo.com/community/threads/responsive-categories-should-be-shown-at-the-very-top.83700/

Then there's this one:

https://xenforo.com/community/threads/show-collapse-sub-categories-as-default-setting-etc.61355/

The latter one proposes a change of behaviour so that the categories drill down rather than loading the category's content.