I am sorry but which search are you referring to?

I am getting the same issue. When you use the search on your world home page (and all sub pages), it is only returning articles. No images, maps or histories. I have even tried searching for a specific image name, history event and map directly by name for each, but no luck. It only returns articles that match the criteria.

Select any article that is tagged, go to the meta data tab at the bottom of the page and on opening it you can see the tag. Click the tag to bring up related content. Articles with the same tag are shown but nothing else. The maps, images and timelines sections are always empty