I think there might be an error in your HTML code that you added. Is it possible to create a temporary login so I can take a quick look?
Sometimes if you forget to properly open or close a div or p tag, then it throws off other parts of the code on your site. This would happen on any theme or any site that uses HTML. The way to fix it is to make sure that there is an Open and Closing tag for your <div></div>
<p></p>
etc… If you don’t have enough, or if you have too many tags, then it would cause something like this to happen.
It could also be another issue with your site, but in order to know for sure I’d need to take a closer look. I’m certain I can find out exactly where the issue is coming from and get it fixed. Just let me know