5D mark iii - why is the black bar at the top and not the bottom when my light doesn't go off in hss

[behanna]

5D mark iii - why is the black bar at the top and not the bottom when my light doesn't go off in hss? I was doing some testing with the light off... just curious why the black bar is accross the top and not the bottom like with my 7D

[kvbarkley]

Just the timing of the shutter.