S.F. - Express tracking issues, anyone? – ParcelTrack - Package Tracker Review

This is currently one of three apps I use and trust when tracking parcels. However, it seems to have problems when I try tracking parcels sent via ‘S.F. -Express’... Has anyone else noticed this? The other two apps I use have no problems getting a status...
Review by TainoV2 on ParcelTrack - Package Tracker.