Labcorp Drug Test Results-A bit confusing

I received my test results back from a personal 6 Panel Urine Test at Labcorp to see what my levels were. It was taken at the 79 day mark of being clean. I got a positive for THC, but as referenced in the first comment is the official report, that seems to say I'm at 17 ng/mL, which is 2 above the DoT cutoff of 15. What confuses me is if I'm tested at 50 cutoff, why it flagged as positive, but GC/MS shows the real level at 17. Am I even reading this correctly? I tried reaching out to Labcorp about their method and if they immediately send it to the lab regardless of initial immunoassay or if they even do an initial testing at all and they gave me some non-helpful boilerplate response.

Is it safe to say that this test is showing my metabolite levels at 17ng/mL or am I misreading it?

Thanks for the help in advanced and the results will be in the first comment of this post!