DId you end up getting retested after receiving these results? Did you get a copy of the lab report? I think it would be a good idea to get a report if you can, and also share it with your primary care physician if you have one.
I recently had a RNA PCR test done, and had some interesting results myself. The antibody came back negative, but the RNA PCR came back as unable to test due to PCR inhibitors in my blood sample. I had to retest and now I'm waiting for the results.
In your case, you might try for another test, or see if a professional can interpret and shed more light on your results.