As we see, the problem is related with html code on your website. You did something wrong and that's why sidebar does not work properly. Please open your website in Firefox html mode (CTRL+U) and check how many html errors you got. Please fix them first and all should be fine.
Sorry but you are not right. You can check all our demos code and you will see that we do not have any html errors. Our theme is free of any html errors and the one you have are only related with what you did on your side. But if you don't know how to fix them, then we recommend to install theme once again on clean database and you will see that everything will be fine.
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please send us url to page where you got this problem and only then we'll be able to have a look on it.