I am using a modified version of the "NonZero" template. Anyway, the index.php page has a line of code that says the following:
<?php // Here is the call to only make two posts show up on the homepage REGARDLESS of your options in the control panel query_posts('showposts=0'); ?>
When it is set to 0 (set to 5 in the control panel), it looks like the posts overlap, and there are issues with posts repeating on the mainpage. When I set it to showposts=1, only one full-text post shows up, and the rest of them are summarized, so you have to click on the title to read it on a single post page.
http://www.nolibel.com is where it is, and that function is set to showposts=0 right now.