I think is because your timeline is sorted by "Top Stories" and not by "Most recent".
You can change the sorting method by taking your BlackBerry browser, and go to http://m.facebook.com/ . There is a button in the top right corner to change that.
Once this is changed, the new sorting method will apply : - on the normal facebook website - on the Mobile facebook website - on the Mobile touche facebook website - on the Facebook app for BlackBerry.
The search box on top-right of this page is your true friend, and the public Knowledge Base too: