If you choose to show the latest posts first, then the plugin will show those – and not the most relevant. The date can not be counted into the relevance unfortunately.
I can’t tell why some items might be missing for “pacha” only from the front-end. It can be a misconfiguration or something similar. I tried to log-in with the back-end details, but I am getting a “User can’t find” error. Can you please check that?