I am using WP-Sidebar in one of our developed websites. After, adding some widgets I found that my sidebar is getting broken. It was happening due to the passed values in the before and after widget texts in the advanced settings for each widgets.
So, if you create below options in plugin settings it will be helpful for users.
Default Before Widget text
Default After Widget text
Default Before Title text
Default After Title text
And, use provided values in widget creation page as default texts.