I suggest you wait two more days and check again. It's still in Beijing processing center now.

2018-01-09 10:33 Beijing processing Center, has imported mutual seal (domestic)
2018-01-09 10:05 BEIJING, the export has been opened and dismantled
2018-01-08 17:25 Beijing Processing Center, the export of mutual seal (domestic)
2018-01-03 18:04 Zhengzhou Processing Center, has been exported to each other (domestic)
2018-01-03 09:57 Zhengzhou, the export has been opened and dismantled
2018-01-03 00:55 Zhengzhou, Henan receiving and sending center, has left, the next station processing center
2018-01-02 23:06 Zhengzhou, Henan receiving and sending center, has been sealed
2018-01-02 22:42 Zhengzhou, Henan receiving and sending center, has received

Ok, thank you for your help, i'll wait and post here for the update

2018-01-11 13:57

Zhengzhou processing center, has imported mutual seal (domestic)
2018-01-11 11:06

Zhengzhou, opened for demolition
2018-01-09 10:33

Beijing processing Center, has imported mutual seal (domestic)
2018-01-09 10:05

BEIJING, the export has been opened and dismantled
2018-01-08 17:25

Beijing Processing Center, the export of mutual seal (domestic)
2018-01-03 18:04

Zhengzhou Processing Center, has been exported to each other (domestic)
2018-01-03 09:57

Zhengzhou, the export has been opened and dismantled
2018-01-03 00:55

Zhengzhou, Henan receiving and sending center, has left, the next station processing center
2018-01-02 23:06

Zhengzhou, Henan receiving and sending center, has been sealed
2018-01-02 22:42

Zhengzhou, Henan receiving and sending center, has received

Why is it got sent back to Zhengzhou?

Now, it's clear that it's going back to sender now. The sender is in Zhengzhou City. You'd better contact the sender to let him know this.

Thank you for your help. I already contacted the seller and hope he/she can solve the problem.

I don't get it, i told him/she that my packet just got sent back to zhengzhou but he/she said it's normal. is he/she don't understand the problem or he/she is telling the truth?

It's not normal. If he doesn't understand, you can only wait the seller gets it.