A long time ago I added functionality to FreeGuide so people could opt to report their use of FreeGuide to under a username, or anonymously. This all happens as part of the latest version check, and you can turn it off, obviously.
Quite a long time ago, Alex broke this functionality, and I haven’t yet made a release that fixes it. Stupid, really, because the usage statistics we’ve got are all-but useless:
Hopefully I’ll get a release out soon that fixes it, and these graphs will become more sensible.