i agree, harder is subjective and only applies if you know dont know the answer
you may have specialist knowledge on a subject but that doesn't mean you could answer every single question on it
I mean you may say you're and expert on, say, the harry potter books - because you have read all the books many times, seen all the films, and love them dearly, and you know all the characters really well, you could tell people all about the ins and outs of the characters, every obscure detail - but what if your questions are more about potions? or magical items? or areas and buildings? etc - things you are not quite as knowledgeable about - you would struggle ... but someone watching, who likes the potions etc most, would think those question were easy.
you just don't know what they will ask
it is a very odd thing for you to claim a set of questions to be 50% harder, just because presumably because they were the ones you yourself were unsure of...?
and to claim some sort of fix...? really?