My Search Results Don't Work

Hi everyone,

I am a semi-new wordpress user and am experiencing some serious problems with my website https://thefreshselection.com

I am not sure when this started, but for a while now I have been experiencing some problems with my search bar on my site. Everytime me or another viewer searches something on my site, the search results simply return all of the posts on the homepage. I have no idea why this is happening, and I have tried doing many things to fix it. I put in the backup search.php and searchform.php files that I had, and even re-installed the entire 2011 theme, but nothing has changed.

Any help or suggestions are greatly appreciated, thank you very much.

Matt