After messing around with the font files some more, I looked into game/citadel/panorama/fonts/fonts.conf and I found that based on the selected language, they are remapping the Retail Demo font to another font which is why those other languages don't have the issue. The problem must be regarding the Retail Demo font. I added an additional match for English so that it also gets remapped, and that resolved the issue for now. You can do this by adding the following to the file where the other entries are under the heading <!-- SANS - Radiance -->.
<match>
<test name="family">
<string>Retail Demo</string>
</test>
<test name="lang">
<string>en-us</string>
</test>
<edit name="family" mode="assign" binding="strong">
<string>Radiance</string>
</edit>
</match>