I'm sure I already explain it somewhere ...
Locus center on know items ... when you tap on any file that contain Network link, in this file is nothing, just link to some url address. So there is nothing to center on. Location of your buddy is known after locus download data from url.
Solution here should be finally panel for handling KML files, but it's not yet available. I have in mind similar panel as exists in Google Earth, where will be visible content of KML file (or content of network link) so then will be easy to center on any item .. but it will need some time