Unfortunately I did not see your copyright or footer menu anywhere. Here’s the problem…when someone begins using other plugins, or makes theme modifications, and they find issues such as what you are describing, support doesn’t really cover this unless I know for sure it’s the theme. The other thing here is that your site is the only one that is experiencing this of the 1000’s who are using my Preference theme. Usually when something breaks a layout, it can be a result of many things, such as a plugin, or perhaps content that is missing an open or closing tag, or perhaps a theme file that was modified can also cause breakage. Without really knowing, means this is a really tough issue because it’s a long time consuming role of finding out what it is.
All I can suggest is that if you remember the last time it was working, then reverse whatever was done to when it started acting up, then it would give you a clue. The other suggestion is to disable all your plugins one by one and see if your page layout goes back to normal (the footer and copyright containers are intact). Then if they show up and stay in place, then you will know if it’s a plugin.
Anytime a theme had a broken structure, it was generally related to someone’s content where an html tag was missing, or custom css was missing a quote or bracket.