It wasnt until i got home and was going to dump the Heron shot that i noticed this,its the first of this type i have seen in Lincolnshire ,the nearest i can find is African helmeted.
From that it looks like the D3300 may have focused past the line but its difficult to tell, you would need to set a better target up and repeat it sevearal times,stand some thing at the side of the focus point like a match box.