Thats because the unipark css file isn’t scripted/coded/written the optimal way. especially in a cms a css command should never style a html tag without a class, they should always address elements with a class or by class only so the plain tag as it might be used by users is still availiable. sadly, they overwrite the style for al “li”-html so they are not displayed as list items anymore.
long story short, try this
<ul style="list-style-type: disc;">
<li style="display: list-item;">test</li>
<li style="display: list-item;">test</li>
</ul>
