It was certainly abnormal, as your adjective 'faulty' recognizes.
I intentionally modified 'faulty' with "(chemical or neurological imbalance due to environment, genetics or some combination)" and note that it isn't necessarily {abnormal\un-normal\unusual} but perfectly natural: it happens frequently.
'Faulty' neurological processes are those that do not function as well as we would reasonably expect them to,...
Or that function at heightened levels of response that sometimes swamp the ability to process information (ADD, ADHD), OR that just do not function in the same ways every time (chemical inhibition\excitation).
The other side of "may have been faulty" is that they may have been functioning properly -- I can't say I know, can you? And if they were functioning properly then that too is natural.
This is a logical sequence of thought, but in standard usage 'unnatural' is not really a synonym for 'supernatural' as you use it here.
versus
Synonyms: ... abnormal, ... supernatural, ... unaccountable, ... (of ~50 given)
Antonyms: natural,
real
OF course this gets us back to perceptions of reality ... including Cho's ... and the question of what is "normal" ...
Enjoy.
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