Your problem is connected with fact that you haven't disabled the Tabs module default CSS file - please disable it in the external files settings - then the problem should dissapear.
Then please also open file css/gk.stuff.css and change font-size: 18px to 16px for the following selector:
- Code: Select all
.gkTabsWrap.vertical ol li
(around line 269.)
Because now the font-size is too big to put three tabs in one line.