Welcome to NeuroTalk:

Were you taking vitamins when this test was done?
If so and you didn't discontinue them, for about 7 days this could
be a false elevation.

Can you give us more information about yourself?

Some autoimmune neuropathies begin to affect the autonomic nerves that supply the stomach and heart. But not all of them.
And not all neuropathies are due to low B12 either.
You could have a DNA methylation mutation that results in failure to methylate (activate) B12...so it cannot work properly.
There is another test called the MMA...which will demonstrate if your B12 actually works. Or you could have run into a lab error.

Many things are possible, therefore.

So please give us a history of what you were doing when this started, including all medications and vaccines you took or are taking.