Do I get refunded if My application gets returned to me due to miscalculation in presence requirement?
If you're application is returned before receiving AOR from Sydney, then your fee will be refunded. However, if returned after AOR, from your local processing center, then only $100 will be refunded, because processing starts after AOR.
Getting back to your question, a miscalculation seems like something that would be caught after processing starts. So I would guess only $100 will be refunded.