I'd only care about the GROSS score anyway...
Having said that, when you think about the way antlers are scored, it makes sense they would count the "inline" as the non-typical. You first have to identify the Main beam which is unfortunately the short part off the front fork there. The eye brow is the G1, then the G2 is the long back one (14"?). Since that tine is missing a fork, there is no G3. The G4 branches off of the main beam (7"?) and that leaves the non-typical, extra inline tine between the G2 and the G4. Hence the large deduction.
That's a dandy buck that I wouldn't be passing up though..!!
"Therefore, wo be unto him that is at ease in Zion!" 2 Ne. 28: 24