Unless a very specific test was used, most folate tests will include folic acid levels - which certainly can be high even when there's a methylfolate deficiency.
.
I like this to the fact that they are testing for incoming nutrients, which might be normal and high for people with methylation factors, instead of testing the amount of the nutrient in your blood stream that has been converted into the form that your body can use.
Without using technical (official terminology) - let's say they are testing for folate (we'll call it A). And if your body needs to add B and subtract 2 before it can use it, then testing to see if the levels of A are correct, does not mean that the levels of AB or AB-2 are correct.
In point of fact, I had all the symptoms of B12 deficiency - but my B12 levels were sky high. I tested off-the-charts for Folate. And I tested at toxic levels for B6. My nuerologist decided that it meant that I needed psychiatric care because in his opinion, people who have those test results don't have B12 deficiency. BUT it was this exact combination of results/symptoms that led me to believe that maybe I just wasn't processing the incoming nutrients correctly and got me to test for MTHFR (which was never tested for even though it had been identified that I had history of high homocysteine levels).
But again, if they are testing for A, then they aren't really testing for AB-2 - which means that they aren't getting to the root of the problem.
I have been on methylation treatment since April and regained about 80% of my energy level and 95% symptom improvement (excluding the energy).