I am developing a website with gantry framework and k2 but then each time i assign a module on the side bar, my sidebar breaks and displays left site below content. i have tried using another template "thenews" and i got the same issue. i have spent hours trying to solve this issue but no luck yet. any help please

Hello, This sounds more like a template issue.
An unclosed HTML tag.
Without a link however it is impossible to tell.

thanks, I found out the issue is with a tab module i use on the pages. i remove the tab module and its fine. i would still love to use the tab but dont know how to make it work without breaking my template

Did you address this issue the module's developer.
An update or a solution might be available.