Door opening stainless thresholds

I am installing the original stainless threshold/sill covers on my 74 E-series GTS. The three original wooden blocks are still there but the two forward blocks seem to do nothing at all. I would assume the stainless pieces were meant to be level but slope downward toward the door seal as they approach the front of the door. I can make them level but I wonder if there was some reason for this or just sloppy work at the factory. Anyone dealt with this issue?