Wiki Tabs Disabling?

Is it possible to disable certain tabs in WordPress wiki? I have implemented the plug in for a clients website but there is some themeing issues associated with this plug in.

He is an example of what I mean.

http://limus.ltionline.com/wiki/limus-test-wiki-one/

If you click discussions or history tab, the theme layout becomes corrupted.

Is there some advice or tips to fix this bug.

Thanks in advance!

http://wordpress.org/extend/plugins/wordpress-wiki-plugin/