I reviewed the latest WidgetFramework code and it looks like they changed the version ID format some time during the 2.5.x branch to use a different format than the 2.6.x branch had (version IDs went from 3-digits to 7-digits), making it possible that some 2.5.x versions have started identifying as being newer than 2.6.0. This is not really a bug in VaultWiki, as versions up until this change are identifying properly; this is more a feature request to add compatibility for newer WidgetFramework versions. If you need WF support now, I recommend using a version from the 2.6 branch, because that should still identify as 2.6.