The pre-IPO market trading is not through the exchange system, but through the internal system provided by third-party to fix up quotes. EleBank's pre-IPO market is an independent internal trading system, and it is very normal to have price differences with other platforms.
Note: Some brokerages may have access the same upstream, so you will see the same quotes
EleBank Causeway Bay Physical Store
Address: Shop S & X, Hong Kong Mansion, 1A-1L Yee Wo Street, Causeway Bay (Exit E of Causeway Bay Station)
Opening hours: Monday to Sunday - 10am to 9pm (The Physical Store's opening hours may be adjusted on certain public holidays. Please refer to the Bank's announcements.)