As screenshot shows, the theme CSS doesn't give table cell enough width to adapt text under different charsets, texts are splitted into two lines.
Solution as below:
Edit /path/to/oxwall/ow_themes/graphite/base.css, line 1860 and 1865, change "width: 1%;" to "width: 7%;", that's all.
I didn't test other themes, maybe also have same problem.
I didn't test other themes, maybe also have same problem.