AO Bake

wr_uk

Is there any obviously  reason when I bake the ao hi to low poly the bake looks like it has hard normals. 

Both hi and low meshes have smoothed normals where required. 
I've played around with the AO setting in marmoset. But nothing seems to correct this. 

I'm exporting from Maya via fbx.

All other maps bake fine

Any ideas? 

EarthQuake

It's difficult to say, can you post some images of the problem?