That's because IDistributionMirror.getOverallStatus() (which is shown on the mirror listing) ignores any MirrorDistroArchSeries/MirrorDistroSeriesSource whose state is UNKNOWN, while IDistributionMirror.getSummarizedMirroredSourceSerieses() and IDistributionMirror.getSummarizedMirroredArchSerieses() (which is shown on a mirror's home page) will always return the MDAS/MDSS with the worst status, which in this case is UNKNOWN.
That's because IDistributionMi rror.getOverall Status( ) (which is shown on the mirror listing) ignores any MirrorDistroArc hSeries/ MirrorDistroSer iesSource whose state is UNKNOWN, while IDistributionMi rror.getSummari zedMirroredSour ceSerieses( ) and IDistributionMi rror.getSummari zedMirroredArch Serieses( ) (which is shown on a mirror's home page) will always return the MDAS/MDSS with the worst status, which in this case is UNKNOWN.