Can you please help me with this:

TN is RP697187231CN
Everything was OK until 02 September, when it was returned from Air Transport for "security" reasons (it's a plain umbrella that I have been ordering before with no problems).

Sep 2, 2019 08:54 Air transport Beijing
Sep 2, 2019 22:42 return Beijing Exchange Station
Sep 3, 2019 09:06 [Beijing] to leave the exchange station, the next stop Beijing International Post [] (transit) Beijing
Sep 3, 2019 14:15 Return, remarks: security check returned

But the problem is that next statuses show that the package is returned all the way back to Nanjing and now is not clear is it still in Nanjing or not ?

Sep 9, 2019 13:54 Import customs clearance, Nanjing
Sep 9, 2019 15:52 Departure, Nanjing international mail], [next international bulk Acceptance Center

It can got out from China only via Beijing, right ? This absence of new data shows that it is lost or something like that, am I right ?

At the same time the seller is assuring me that it is moving again, plus the track checker on this site, as well as on AliExpres (Cainiao) site does not mention anything after 01 September. Can you explain that phenomenon ?!?