nope not deformed, its already in the book registered, he probably hurt his horn when he was young, thus it bending back a bit more, as far as n know alot of the top 10 trophies has one long long horn and one short, look at the kudu taken this year, one horn 72 1/2" other one mid to early 60", with the long hornest horn bending back.
and why is it abnormal, its naturally developed so they (RW) measure the longest horn bent or not.