- My dad turned around and stared at us, his fear confirming that something wasn't right ― and maybe even very wrong.
One student struggles to understand the sentence especially in a bold part. - and (something) "may be even very wrong" or "- and maybe even very wrong". I think he/she is unsatisfied with the verb coordination after the conjunction "- dash" with the previous that clause.
In my opinion, it's simply explaining the extent of the dad's judgement (wasn't right - even very wrong). So, maybe is better than may be in the sentence.
Is it an idiom (I saw "Not Even Wrong" as a phrase) or any typos or something else?