Were you sure that the earlier tests were done at accredited labs? If no, then that might be the thing.
Or if you did the earlier tests in accredited labs,you might have reactivated the virus with drinking. Because alcoholism
has an adverse effect on liver
and the virus also affects your liver and research has shown that alcoholism worsens viral hepatitis
. This is unusual. But theoretically can't be ruled out.
You might have to stop drinking in any case since it damages your liver. For your HbSAg status (You are called a HbSAg "carrier")you need constant monitoring for worsening of symptoms by regular checkups with a doctor once every 6 months.