When I add multiple categories it breaks my report and the categories are on top of each other instead of side by side. I have attached a screen shot of what it looks like. Please let me know if there is something else to show that would be more helpful.
It looks like you're adding multiple category axes. They're doing what they're supposed to do... stack on each other. If you want to view these fields side by side, you'll have to put them as series on the same axes.