Hi Georgia,
To answer your question about searching, there are some filters that would cause the search results to appear inconsistent. One of the filters, "Match Whole Words," would prevent searches for making on a substring of a word. The other filter toggles the types of Items to search for, which may cause some search hits to get filtered out.
However, for your specific use case, we were able to duplicate the same behavior, so we've open up a support ticket to get it resolved.