Thanks!
The theme is perfectly fine, the issue is something else. I have found that the search results page is completely replaced by a plugin, possibly the BuddyPress Global Search, but I’m not sure. The source of the page looks like it is replaced with buddypress related elements, and I assume it might be that plugin. If I’m right, then it is probably a separate search engine as well, so it displays it’s own results, which are not affected by Ajax Search Pro.
I suggest trying turning off that plugin, I’m almost positive it will restore the original theme search results page, and the ajax search pro override should work there as well.