The reason for this may be due to the tracking information is updated when the packages can buy the shipping carrier.
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Even though this is a common problem but still USPS is working hard to provide the best satisfactory results for the customers.
If you believe you used duplicate labels in shipping, In some cases, UPS fails to scan a package; however, tracking will update when the package is scanned at its first transfer point.
USPS Not Updating : United State Postal service, USPS is an independent agency of United States government which is responsible for providing Postal Services all over the United States of America.
It can take between 24 and 48 hours for UPS tracking to update: less time if you took it to a store, more if you handed it to a driver or dropped it off at a drop box location.
If you took your package to UPS on a Friday, Saturday or right before a holiday, tracking could take an If you took your package to the post office or otherwise shipped via the US Postal Service, tracking will not update. If you shipped with a carrier other than UPS, tracking for your package does not update in our system.