In reply to Sami.

There seem to be a few things Facebook hasn't addressed here, and this is one of them. I'm hoping that before long they decide to let you "drag and drop" which five photos you want to appear there, rather than the current mess.
For now, this should work. Follow the steps I outlined in this post for making it so that ONLY your profile pictures appear in the photo spread. If you've accidentally deleted something from appearing in your timeline, find the original photo (not the one in your profile pictures album, but whatever other album it's in) and set it as your profile picture. This will make a new copy of the picture in your "profile pictures" album, and it should appear once again.
To test whether or not this has worked go to privacy settings, hit “customize,” click on the top-right button that says “preview my profile.” Here, you’ll get a display of your profile as it “looks to most people on Facebook.” You can start typing in different friends names in order to get a better idea of what’s on display to individual people or groups.