Boris - do not fret. Its a good setup - just needs some very minor adjustments. Now that I read my last paragraph it confuses me also. That black cutting blade should angle to the rear slightly as it touches down. As I see it in the pictures the blade currently angles slightly to the front - meaning, cutting edge forward, attachment point to the rear.
Having the black blade vertical or angling toward the rear slightly should help greatly. Think of my heavy duty Rhino rear blade - As I clear my driveway I can have the blade curved forward or reverse it and have it curved rearward. Curved rearward will not dig into my, not yet frozen driveway, also will not bounce/jump around and come spring I will not find half my gravel in the berms. My driveway had better be frozen hard a granite if/when I use the blade in its "normal" configuration.