please briefly explain what is happening here
[Guangzhou] to reach [Guangzhou] exchange station (transit)

2019-12-23 22:46:47

[Guangzhou] Guangzhou International [leave], [next] Guangzhou station exchange (transit)

2019-12-23 22:40:51

[Guangzhou] [] Guangzhou International has been exported straight seal

2019-12-23 09:13:14

[Guangzhou] [return] Guangzhou station exchange

2019-12-23 08:49:53

[Guangzhou] to reach [Guangzhou] exchange station (transit)

2019-12-19 23:03:18

[Guangzhou] Guangzhou International [leave], [next] Guangzhou station exchange (transit)

2019-12-19 22:44:42

[Guangzhou] [return] Guangzhou station exchange

2019-12-18 14:34:08

[Guangzhou] to reach [Guangzhou] exchange station (transit)

2019-12-17 23:04:51

[Guangzhou] Guangzhou International [leave], [next] Guangzhou station exchange (transit)

2019-12-17 22:52:23

[Guangzhou] [return] Guangzhou station exchange

2019-12-16 12:47:14

[Guangzhou] to reach [Guangzhou] exchange station (transit)

2019-12-14 00:32:41

[Guangzhou] Guangzhou International [leave], [next] Guangzhou station exchange (transit)

2019-12-14 00:19:42

[Guangzhou] [return] Guangzhou station exchange

2019-12-12 16:48:23

Hand over to airline

2019-12-10 01:09:55

[Guangzhou] to reach [Guangzhou] exchange station (transit)

2019-12-09 23:48:02

[Guangzhou] Guangzhou International [leave], [next] Guangzhou station exchange (transit)

2019-12-09 23:39:02

[Shenzhen] leave [Shenzhen] international bulk mail processing center, next [international] Shenzhen

2019-12-04 22:01:41

[Shenzhen] leave [Shenzhen] international bulk mail processing center, next [international] Shenzhen

2019-12-04 21:48:54

[Shenzhen] leave [Shenzhen] international bulk mail processing center, next [international] Shenzhen

2019-12-04 21:18:12

Received by line-haul

2019-12-04 21:06:26

Outbound in sorting center

2019-12-04 21:05:25

Inbound in sorting center

2019-12-04 21:05:25

Accepted by carrier

2019-12-04 20:56:45

Logistics order has been created (AliExpress platform)

2019-12-04 11:36:49

Tracking number CP393498513CN says Guangzhou exchange station return. Does this mean it’s on its way back to the seller? Or just returning to the station to wait to get on a plane again? Or something else? Should I contact the seller or is this normal?

My pack stating in the same place
LW243568664CN
Guangzhou, Guangzhou Exchange Station returned
2019-12-11 18:58
Guangzhou, Back
2019-12-11 10:12
Guangzhou, delivered to air transport
2019-12-11 09:29
Guangzhou, leaving Guangzhou International, the next stop , Guangzhou Exchange Station (via transfer)
2019-12-11 05:03
Guangzhou City, "Guangzhou International" return, note: security return
2019-12-10 07:02
Guangzhou, delivered to air transport
2019-12-09 11:13
Guangzhou City, "Guangzhou International" return, note: security return
2019-12-05 06:40
Guangzhou, delivered to air transport
2019-12-05 04:34
Guangzhou, arriving at Guangzhou Exchange Station (via transfer)
2019-12-05 02:36
Guangzhou, Guangzhou International has been exported directly sealed