(Recent) Posts are only partially being listed on the Blog/Post page

Hi there! The overview of the posts on my Blog/Post page is displaying the posts only partially: - I got a total of 29 published posts properly listed on the wordpress-admin page for Posts >> All Posts - On the Blog page though only 10 are displayed: Plus: The most recent two aren't shown on top - even though the dates are chronological correct. Plus: On the very bottom of the Blog list there isn't a button anymore to show "Older Posts". - On the sidebar of the Blog page you even have a correct list of the Recent Posts. Settings >> Reading: - Blog pages show at most: Initially set to 10. For testing purpose currently set to 99 The latest post which is displayed is "Watzmann". However after the Watzmann post I've published "Hochkoenig" and "Hochstaufen under the moon" - which can be senn on the right in the sidebar. Why is that so? Skandha, before it will come up anyway: It does not make a difference if I activate or reinstall the recommended plugins. No matter if I turn back on the entire package one by one or all together - the issue stays the same. Thanks for helping out! Thomas