Currency shows diffferent on different pages

Hi,

I set auto detect for currency. My primary currency is HKD, following that is USD. I physically is in HK. However, I got homepage showing USD and product page showing HKD. I assumed I should got HKD on homepage and so on. Furthermore, I enter my website.com/?wmc-currency=hkd, and I still shows the USD instead of HKD. At least the domain is not always working.

Thanks in advance