What is the cause of high facial convexity

[vvs445]

I have a facial convexity angle of around 174 which is on the high end of ideal. What is the reason for this, recessed maxilla, or protruding mandible/brow or a combination of both? No pic just in general

 

[vvs445]

bump

 

[Foreverbrad]

The irony is that a high facial convexity means a less convex face.

Recessed nose / maxilla I guess.