Other than that, I took a look at your avatar post (featuring some nice avatars):
Rawhide said that it is really bad to use [th] outside the first row of a table, and should be avoided unless strictly necessary. You can replace your [th] with [td="bgcolor:#8E5A2E, align:center, colspan:??"][color=#FFFFFF][b]<Category>[/b][/color][/td] - this gives the same result. And while we are at things that aren't really good: You should always have the same amount of table cells in each row. So best add some empty ones (or break your table into different tables with the same amount of cells each).