Why the order stay in "submitting" state?

Because of the trading rules of the Hong Kong Stock Exchange, customer orders can only be submitted within the specified time range and price range. Therefore, our system will place the customer's orders that have not reached the Hong Kong Stock Exchange's submission standard in the broker's internal order queue and set the status to "submitting". After reaching the submittable standard, the order will be automatically submitted to the exchange.

 

You can visit the official website of the Hong Kong Stock Exchange for more trading rules details.

https://www.hkex.com.hk/-/media/HKEX-Market/Services/Rules-and-Forms-and-Fees/Rules/SEHK/Securities/Rules/Chap_5_eng.pdf?la=en