Looks like you've got some extra HTML tags throwing things off. Here's your code right now:
<ul style="margin-top: 0%;margin-left: 0%;">
<p><strong>
</strong></p><li><strong> <a href="https://signfrog.neocities.org/pages/summary.html" target="mainframe">HOME</a></strong></li><strong>
<li> <a href="https://signfrog.neocities.org/pages/aboutme.html" target="mainframe">ABOUT ME</a> </li>
<li> <a href="https://signfrog.neocities.org/pages/blogmenu.html" target="mainframe">BLOG</a> </li>
<li> <a href="https://signfrog.neocities.org/pages/art.html" target="mainframe">ART</a> </li>
<li> <a href="https://signfrog.neocities.org/pages/dreamlog.html" target="mainframe">DREAM LOG</a> </li>
<li> <a href="https://signfrog.neocities.org/pages/reviews.html" target="mainframe">REVIEWS</a> </li>
<li> <a href="https://signfrog.neocities.org/pages/grandlibrary.html" target="mainframe">GRAND LIBRARY</a> </li>
<li> <a href="https://signfrog.neocities.org/pages/map.html" target="mainframe">MAP</a> </li>
<li> <a href="https://signfrog.neocities.org/pages/links.html" target="mainframe">LINKS</a> </li>
</strong><p></p>
</ul>
Notice how lines 2 and 3 have a bunch of extra <p> and <strong> tags mixed up in the <li>:
<p><strong>
</strong></p><li><strong> <a href="https://signfrog.neocities.org/pages/summary.html" target="mainframe">HOME</a></strong></li><strong>
You should remove those so it's only the <li> tags, like this:
<li> <a href="https://signfrog.neocities.org/pages/summary.html" target="mainframe">HOME</a></li>