Sounds like something like a container is broken that contains content. Did you add any html code to any content that shows up in those areas…such as the bottom area? If you are missing an opening or closing tag, that can do it. Link to your site?
As for your other question….a bit tricky if you want to control the width and maintain responsiveness, but you would have to do some custom CSS for the search widget when it’s in that widget position.
For screenshots, they might be too big to attach, so you can use the Email Support form from the Support page to send me the screenshots.