discrepancy with IGG type 2 scores

About 8 weeks ago I had a full panel of STD testing.  They did a herpes IGM which indicated that I was positive with a score of 1.12.  Two weeks ago I had a repeat with an IGG type specific test which indicated negative for herpes 2 with a score of .08.  I also had another IGG test recently with a score of .91 which was also negative for herpes 2.  My IGG for herpes 1 was 4.1.  Obviously I am positive for type 1.  Is there any reason there is discrepancy between the two IGG scores for type 2?  Is there really a need to retest in a few months?  They tell me that .91 and lower is negative.  Should I worry since I was just on the cusp with .91?  Any information you could give me is greatly appreciated.  Thank you so much.