Although such false results are uncommon, probably you will now agree it would have been best if that test had not been done.
In any case, that test
clearly was false; the subsequent test
in Hong Kong prove you do not have HIV
. In other words, your HK doctor is exactly right. You do not need any further HIV tests. Please don't have another one unless and until you have other exposures that put you at risk (which certainly will not include any oral sex events).