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Our service built so it send notification on every new status added to database, because of that sometimes it can duplicate notifications. Duplicates could be sent for several reasons.
Seller's shipping method - is not a company, but just a sign of shipping of order using transport company - not an Aliexpress partner. Seller's shipping method could be any transport company.
As a rule, seller add tracking number and transport company name in order details.
If your item send via Seller's shipping method, but seller haven't provided transport company name, then you have to contact seller and ask a link to a transport company's site.
After that, just pick you company from list and track. If thre's no company in the list, then please notify us about it.
Often Seller's shipping method - is a local logistic forwarder which has tracking only in China.