probably crap test have been used, if no abbott architect or siemens machines available in your country just get retested next month by the following tests:
hbsag
hbsab
hbcab igg
hbcab igm
if tests are cheap for you or if you have free healthcare insurance or government healthcare get tested for hbvdna pcr too with sensibility about 10-20iu/ml.if sensibility is higher lie 30-60iu/ml the test is useless
You really should go to the HBV forum, this is the hcv forum not many ppl know about hbv here. Sorry :(