If by alignment mark you are referring to the vertical bar on the leaf (gold or platinum)that lines up with the bottom of the notch - they should be on the 'sharp side' facing you as Huvius suggested above, not on the scalloped side.

The 'scallops' purpose is to thin the notch's metal to reduce glare produced inside the notch from the surface of the cut. The thinner that surface, the less light/glare will be produced.

The scallop itself will also collect and project light - but since the scallop faces (should be) the front sight, that bouncing light does not effect the shooter.

If the scallop is facing you, the glare around the notch will be increased due to the increased surface area of the scallop deflecting/re-directing light- back at your eye.

The curved surface of the scallop will collect and project light from about any angle behind and to your side - not what you want. If the vertical alignment platinum or gold bars are on the scalloped side, well, that sight sounds as if it is bass-ackwards, to me.