Left_top Position has a problem... Please Help!

Hi, friends i have a serious problem... when i try to move mod_gk_tab (module) from right_top to left_top position, the module do not work fine even with the demo template. But the problem going more deep, is not just the problem with the mod_gk_tab, the same proble still is i use any module like poll, warpper, and so on...

Please a need fix this any idea...
Thanks for your time and help

I attach a screenshot of the problem...