Hey kohaku,
I’ve had a look and it looks like all of your nav links in your horizontal nav point back to the ‘root’ WP install.
Can you post the code for this navigation:
<div id="navigation">
<div class="menu">
<div class="block"><a class="menu" href="https://www.infragilis.net">blog</a></div>
<div class="block"><a class="menu" href="https://infragilis.net/about">about</a></div>
<div class="block"><a class="menu" href="https://infragilis.net/domain">domain</a></div>
<div class="block"><a class="menu" href="https://infragilis.net/about/booklist">booklist</a></div>
<div class="block"><a class="menu" href="https://infragilis.net/archives">archives</a></div>
<div class="block"><a class="menu" href="https://infragilis.net/contact">contact</a></div>
<div class="block"><a class="menu" href="https://colourlovers.com/lover/infragilis">colour♥</a></div>
<div class="block"><a class="menu" href="https://feeds.feedburner.com/infragilis">rss</a></div>
</div> <!-- end menu -->
</div> <!-- end navigation -->
It’s quite obviously linking back to the ‘root’ WP install, but it would be helpful to see the file, or code, that’s generating this menu.