I found an issue when using this plugin in conjunction with a theme based on Genesis Framework. In Search results page, the featured image of the first post of the blog appears just before the search results. This happens because the framework uses a hook to put the featured image in the main loop, and the code used by your plugin to "fake" the request does not prevent it. I think that the
seed_glcse_hook_search_results function should be adjusted to better handle such situations.