That sounds rather strange. I would definitely be asked to be retested and go through another lab for the work. At diagnosis, I was only told I was 677 and don't worry, this one pill will be fine. I was getting sicker and sicker. Come to find out the foltx is a synthetic B supplement that was building up more toxins in my body b/c it is a cyanide derivative. The entire time, I needed the methyl (natural) form of B. Now I am A1298C and C677T. If you would like to email me, you may. ***@**** I have tons of research, articles and journals that I can email you that have been given to me by other people with MTHFR mutations.
I would suggest meeting with a perintolgist & they can explain how it comes through the gene pool. Another option is to ask whomever ordered these tests. Best Wishes